They are supposed to be rebuilt 1971 date carbs I bought from a company that remans the carbs. I just took the car up to have a new exhaust put on it so it is not here right now to get the part #'s. But what could I use to seal up those holes? do you put some tape on the back side of it and put some jb weld in it from the top and then remove the tape when dry? or will rtv work? I would be worried about the fuel with that? Thanks