A 1956 Buick Special barn find doesn’t usually come with a $900,000 price tag, but this one earned it: twin turbos strapped to a 401 Nailhead V8 push output to roughly 800 horsepower, backed by Ride Tech suspension and a Corvette C6 independent rear end. The Nailhead’s origins as a quiet 236-horsepower luxury engine make the transformation even more remarkable. Here’s what makes this one of the more unexpected restomod builds in the muscle car world.