The Coyote Swap Playbook: Why This 1970 Mustang SportsRoof Traded Its Small-Block for a Supercharged 5.0

A 1970 Ford Mustang SportsRoof gets a complete heart transplant on PowerNation’s Detroit Muscle, swapping its original small-block for a supercharged 5.0-liter Coyote V8 paired with a Tremec TKX five-speed transmission. The build leans on ARP fasteners, Detroit Speed headers, and a custom belt-drive system to make the modern powerplant fit a decades-old engine bay. Viewers in the comments debated the real cost of the swap, with one builder pricing out a $305 header alternative to the show’s $3,500 name-brand set. The result is a classic fastback built to run with cars its original engineers never had to worry about.

A fastback that once wore its small-block like a badge of honor is about to lose it — not to rust, not to neglect, but to a deliberate decision from a build crew chasing something bigger. The shape is instantly familiar to any muscle car diehard, the kind of silhouette that still stops foot traffic decades after it left the factory floor. But underneath that sheet metal, something with a supercharger whine is about to take up residence, and the transformation is nowhere near as simple as bolt-in-and-go. One online commenter compared the process to the classic “if you give a mouse a cookie” problem — pull one thread on an engine swap and the whole car unravels, part by part, invoice by invoice. Parts lists get tangled, budgets balloon, and even seasoned builders hit snags they didn’t see coming. So what does it actually take to give a 1970 Mustang a heart it was never built to hold?

Meet the EBC Fastback Behind Detroit Muscle’s Latest Build

The car anchoring this episode of PowerNation’s Detroit Muscle — Season 8, Episode 15 — is known on the show as the EBC Fastback, a 1970 Ford Mustang SportsRoof being reworked from a classic small-block cruiser into what the hosts call a “muscle-packed stallion.” Detroit Muscle has built a reputation for chronicling full-scope resto-mod builds rather than simple bolt-on jobs, and this Mustang follows that formula: strip the drivetrain back to bare essentials, then rebuild it around a modern powerplant designed to outrun anything the original engineers imagined. The SportsRoof body style, with its fastback roofline and recessed rear glass, was one of the most aggressive silhouettes Ford offered in 1970, making it a natural canvas for the kind of power upgrade this episode centers on.

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The Supercharged Coyote Swap at the Center of the Build

The headline swap is a supercharged 5.0-liter Coyote V8 dropped in place of the Mustang’s original small-block, a transplant that instantly changes the car’s character from vintage cruiser to modern-era sleeper. Coyote swaps have become one of the most common power upgrades in the Mustang restoration world because the payoff is worth the fight, not because the install is easy. The Coyote measures roughly 29 inches across those four cams and coil covers, and on a 1965-1970 Mustang the shock towers sit exactly where that width wants to live, so builders either slim and re-plate the towers or cut them out entirely for an aftermarket front end. In that comparison the LS is the compact, easy swap, not the other way around. Adding a supercharger on top pushes output well beyond anything a stock 1970 Boss 302 or Mach 1 ever produced from the factory, and the Detroit Muscle crew treats the install as a season-long showcase rather than a single afternoon in the shop.

Why the Tremec TKX Transmission Was the Right Call

Behind the new engine sits a Tremec TKX five-speed manual transmission, supplied through American Powertrain, a gearbox purpose-built for exactly this kind of classic-to-modern drivetrain swap. The TKX line was designed to handle serious torque while still fitting inside the transmission tunnels of vintage muscle cars without major floorpan surgery, which is part of why it shows up repeatedly across resto-mod builds featured on PowerNation programming. Pairing a stout five-speed with a supercharged Coyote gives the EBC Fastback a drivetrain combination that can survive both daily street use and hard runs down a drag strip, a balance the original three-speed and small-block combination was never engineered to hit.

The $3,500 Header Question Viewers Couldn’t Stop Debating

Detroit Speed’s 4-1 header set, part number DSR-061005 and sourced through Summit Racing, became one of the most talked-about components of the build in the comments section. One viewer did the math and noted the headers alone cost roughly half as much as the supercharger itself, prompting them to detail a $305 alternative built from flipped Flowtech turbo headers and a home welder instead. That kind of cost breakdown is common in the Coyote-swap community, where header selection has to balance chassis clearance, exhaust note, and budget — and it’s exactly the sort of tradeoff Detroit Muscle’s build videos tend to gloss over in favor of using name-brand sponsor parts.

ARP Fasteners, Duralast, and the Unsung Hardware of a Swap

A swap this involved lives or dies on the hardware nobody notices in the finished product. The build relies on ARP bolts and fasteners throughout the engine assembly, a brand favored in high-performance builds for fastener strength under boost, along with a Duralast starter to handle ignition duty on the new combination. Matco Tools, listed as the official tool supplier for the Detroit Muscle series, outfits the crew’s toolbox for the fabrication work, while a Power By The Hour belt drive system manages accessory routing around the supercharger snout — a detail that matters enormously once a blower changes the geometry of everything bolted to the front of the engine.

How the 1970 Mustang SportsRoof Stacked Up in Its Own Era

When it launched, the 1970 Mustang SportsRoof competed directly against the Camaro Z/28 and Plymouth ‘Cuda for buyers chasing factory performance, with the Boss 302 and Mach 1 trims representing Ford’s top answers in that fight. None of those factory drivetrains, however, came anywhere close to what a modern supercharged Coyote can produce, which is exactly why resto-mod builders gravitate toward these bodies: the shape and proportions already look the part, and a modern engine swap finally lets the car deliver on what its styling always promised.

What Comment-Section Viewers Say About the Coyote-Swap Trend

The reaction online split between admiration and sticker shock, with one commenter joking that Tommy — the build’s lead — should run for office given how naturally he explains each step, while another flagged frustration that several parts links in the video description were broken or mismatched to the actual components used. That tension between polished on-camera execution and the real-world hassle of sourcing parts is a recurring theme in resto-mod content, and it’s part of why builds like the EBC Fastback generate such active comment threads: viewers aren’t just watching, they’re pricing out whether they could do it themselves.

Is a Supercharged Coyote Swap Worth It for a Classic Fastback?

For owners weighing the same swap on their own SportsRoof, the Detroit Muscle build offers a real-world budget lesson as much as a performance one: a supercharged Coyote, a Tremec TKX five-speed, ARP hardware throughout, and name-brand headers can easily stack into a five-figure investment before paint and interior work even start. What the finished car buys in return is a 1970 fastback that can run with modern performance cars while still carrying the styling that made the SportsRoof famous, a tradeoff that resonates with the comment section’s mix of admiration and financial reality checks. Whether that math pencils out depends entirely on whether the goal is a trailer queen or a car built to actually be driven hard.

Catch the full video above. Share your thoughts in the comments below.