This is one remanufactured Rochester 4GC 4Jet carburetor. It was replaced by the Quadrajet carburetor in 1965. It was often used in GM vehicles from the late 1950's until the mid 1960's.
This particular carburetor came to us in a close-out from a carburetor rebuilding company (Precision Automotive Products). Looking through the fuel inlet port one can see a new fuel filter element has been installed. Short of disassembling it we can't tell more than that, so we are listing it as remanufactured. This carburetor did not come in a box, and is missing the little triangular tab that identifies the specific model, we cannot offer fitment guidance. If you are into old GM carburetors you probably know more about what this carburetor will fit than we do.
We have exactly one of these in stock, and when it is gone it is unlikely that there will be another one.
Feel free to reach out to us with any questions on this or any of our other items.