a 273 is not the first Mopar small block either. The poly 318 is a small block too, as well as the earlier engines such as the 301 and 277. It's just the heads are bigger than the LA engines. The blocks themselves dimensionally measure the same as the LA blocks. Also, the 273 4bbl is not a "Super" Commando 273....just a Commando 273 (or Charger 273 in a Dart). Last I checked, AMD does not make a floor pan for the '66 and earlier A-bodies.....ones that fit anyway. I've talked with some guys who have bought them, and all of them said that by the time you modify them to fit, they would have preferred to have just make one from scratch with a flat piece of steel instead. There is a company that does reproduce the floor pans however.....their name slips my mind at the moment....when my senior moment is over, I'll post the name!
