A barely-running 1968 Mustang, bought for $9,500, gets a fuel-injected V8 heart transplant from an unlikely donor — a Ford Explorer, not another Mustang. No Bolts Left Behind compresses nine months of wrenching, a custom EFI wiring harness, and a full drivetrain overhaul into one build, and viewers are calling it the most approachable engine swap they’ve seen in years. Watch to see why the donor engine choice has over a million viewers rethinking what a budget V8 swap actually requires.