So carburetors’ bodies were cleaned.
Float bowls’ gaskets gave me a bit of work. as they were glued to bowls from factory and after mostly forty years glue and gaskets hardened. To cut them off with a knife might look good idea, but I didn’t wanted to damage float bowls. So instead I put bowls into hot water for an hour, or so, and after some soaking gaskets became softer and thus more removable.
These works I made to warrant the tight fit of velocity stack to carburetor. And as you may see from photos below inner transition from velocity stack to carburetor is also very smooth. Thus, there is no need in any sealing gaskets or O-rings.