R4360-A or R4366-A are the only two numbers I could find in an old motors book. Might have something different in the factory service manual. The carb is pretty specific though, since the bowl vent valve feeds a tube instead of dumping to the atmosphere and has a green wire with a grey (I think) connector to connect to the distributor vaccum advance can/solenoid. Once you see one, you can pick it out of a pile of holleys in an instant, the good thing is usually if you see one at a swap meet, no one wants it so it goes for cheap!