Dan, Several different carbs will bolt onto your intake and will function well. from about 1966 through 1983, These carbs used on the 360, 383 and 400 had more air flow and were a larger size then the carbs used on the 273 to 318 motors The smaller 318 carb and the larger 360 carb do not interchange. Mopar used either a Carter Carb in the early years and switched to Holey carbs in 74, I think, probably due to the emissions enforcement Both the larger Carter and the Holley both fit the intake and back then were not a difficult thing to interchange, I think the rerouting of the gas line was about the hardest part of the swap.

I suspect the biggest difference between the Holley carbs off a 360 and the Holley carbs off a 383 or 400 was probably the jets and the metering rod diameter. Over the course of time, several things changed inside the Holley carbs. I used the generic carb kits because those had all the gaskets and I would just use the gaskets that matched the carb in hand at the time. As the production dates of the vehicles and their OEM carbs moved on, the amount of adjustments the average person could make disappeared. The early 70s carbs were much more adjustable then the late 70s carbs were. Also of note is that many of the adjustments on the late 70s and early 80s carbs were more complicated to do correctly. It is my opinion that the earlier carbs were better carbs, but time has not done them any favors. Worn throttle bushings has become a huge problem with carbs and those worn throttle bushing have become a vacuum leak that is hard to detect. Gene