I have gotten alot of info from this site and have a couple of questions. I understand that my 53 5700 has a 58 235 which is longer than the original 235. Jim Carter has an adaptor plate for this swap. I don't understand the reason for the plate. Isn't the pump mounted into the blockface? I'm not at home, so can't look at the moment. Trying to decide the best, not easiest, way to proceed-- new shorter pump, or adaptor plate with original pump.