Maybe instead of a true nostalga class, make them run funny cars that actually represent the model they're supposed to look like. If you want 2dr's make them actually look like a Mustang, Challenger, or Camaro. Want something slippery and the number of doors be danged, make them look like the Fusion, Camry, 200, Malibu, ect. Yes, distort them some to fit the chassis, but make them look enough like the model they're based on without resorting to just grill and lights stickers on a blob as an identifier. More Stock in Pro Stock would be good too, instead of everything special and specific, why not build it off a stock platform or at least go back to stock bodywork on a tube frame with an engine that is somewhat related to what's on the street, even if it's made specifically for racing . Then when it comes to EFI vs Carbs, look again at some of the street racers, tuners, hobby racers that don't have as stringent rules and are willing to play with modern technology, there's power to be had in a good EFI system, and not some "lipstick on a pig" TBI nonsense that even GM gave up on by the late 90's either.