The primnary difference is the type of choke. There were 3. A manual choke, A divorced choke in which the actuating coil was located on the exhaust manifold and a linkage rod ran up to the choke plate lever. An intergral choke which is the one with the housing on the side of the carb containing the coil which was heated by vacuum pulling heat from a manifold stove or electric. Beyond that most all the body and floats were the same. Most so called carb kits are simple tune up kits with gaskets and a few hard parts. A more complete kit for a major overhaul generally will include new floats. Have your local auto supply check for a listing of the complete overhaul kit. Having the little triangle brass tag that shows the carbs exact model number will make sure you get the right o/h kit.
