That was one of the larger body Mach I style cars, and I think there were several engine options for them. The 351 Cleveland would definitely be one of the options. It got scaled back a lot in 1972.What I meant by "done right" is meticulous attention to every detail. The engine was tuned right as a combination. It started with a block that was machined precisely, and rings and bearings fitted to that. Then a cam, intake and headers were chosen to match the heads and application. The same care went into the drivetrain, transmission and differential gears were all gone through and chosen for performance. Same with suspension, tires and even body, paint and interior. The car was definitely done right.