Ok I guess I am not too smart. I began this swap to a short shaft pump because I read here somewhere that is what I needed to do. My engine is still out of the truck I figured I would get this done before I put it back in so I have no idea how close to the radiator I would have been with the original water pump on the 1956. I am soooo confused now. Is someone telling me I did not have to replace the 1956 water pump