REAL production (templated) STEEL bodies, with no more clutchless transmissions, 5-speeds, only, and a choice of turbocharged, supercharged, or nitrous assisted 355 CID small blocks in a variety of configurations (Chevy, Ford, Mopar, etc) vs. Mountain Motor 700 CID Big Blocks that are restricted to gasoline only. Flat hoods only on cars without superchargers; fuel injection of any kind, permitted.