OK, I have a 1969 Roadrunner. It has a matching 383ci engine with a 4bbl carb. At the moment the car has an Edelbrock Carb, not sure which one but my guess is its the AVS version since that is what I understand was stock, the difference being Plymouth was using the Carter Carburetor. I believe from what research I've done the correct Automatic Trans and No Air carburetor was Carter 4616S. If you had Air and Automatic it was a 46385S. Not sure if they are interchangeable or not, but I would think the Air Conditioning Carb would work in a non-air car and not the other way around. To be honest, I'm pretty far from being a mechanic. I know where the key goes and where to put the gas in, but that is about as qualified as I am to work on an engine. Anyway, I've given some thought to finding a Carter and having it installed in the interest of originality. But I haven't read a whole lot of good things about the Carter, which I'm thinking is probably why the previous owner of the car swapped it out. Any thoughts on this?