As stated, a 1954 235 or 261 would make the job much easier as the later 235s had a water pump that you'll have to modify to make it work. Your bellhousing will bolt to all 216, 235, 261 and GMCs. Big thing to watch out for is, don't attempt to mix years of starters and flywheels, different teeth one early years vs later. Also you may have to use your original front motor mounting plate behind the timing gears, it will fit your new 235. There have been many articles on this swap, check tech tips on this site also check out INLINERS.ORG for tech tips. Good luck
