Close to the same thing. I just went thru the 350 for my 1974 Stingray while I replaced the frame. I replaced all the pulleys with chrome ones, a chrome alternator case kit w/dual pulley, and chrome p/s pump pulley. Put it all together and the alt belts were out of alignment. Checked the new pulleys against the old and they were exactly the same. Same water pump, same alt guts, same stock mounting brackets, no shims under pump pulley. I had to put a 3/16" thick plate between the alt bracket and front of the head where it mounted to get the belts to line back up. I'm thinking that I just never noticed it before as it never gave me any trouble and caught it on reassembly.