I had an OI414 #141.
We had the Ford 192D that Hollman Moody marinized. Great reliable tractor engine. We replaced with a Yanmar 76 HP (long story but would most likely be better one size smaller) Speed under power was impressive swinging a large prop but remember the speed comes from increased water line (squat). Must remember to keep your stern ports closed!
Change out was done without cutting any holes.
Disassemble auxiliaries, trans, exhaust manifolds,etc/ Raise engine using halyard with thin spectra tail through binnacle. Once raised, timber up even with engine room opening, slide out into walkthrough, forward to main cabin and then up through companionway.