As posted above, some 1953 235s or all 1954/1955st-series high-pressure 235 or a 261 would be the easiest swap. The water pump is in the correct location.
Later 235/261 engines can fairly easily have their water pump location "adapted". (Tech Tips are available)
Some later 235/261 engines had front-side engines mounts - the front plate would have to be swapped.
Look for engines and feel free to post their
ID codes here.
People will ID the engine and inform you about what adaptations might be needed. The adaptations would not be too difficult - certainly less difficult that adapting a non-235/261 engine.
