I recently changed out a 235 out of my 54 6100 to a 250 out of a 75. The bellhousing bolted up just fine with out any trouble at all. The water pump was too long but so was the water pump on the 235. The PO had cut the radiator frame and it in front so i just left it that way. If you want more info on motor mounts and linkage stuff come on back. Redcoat