On a positive front I happy to say I sold our old broken Yanmar 2GM20F engine for $500. This no real success story as the engine had easily well more than that in newer parts, but it's gone and now we can move forward. Plus, we were starting to look like a floating junk yard with a disassembled greasy engine sitting on the deck. Deck are now clean as well as the engine room.
Next steps include extending the engine bed rails to accept the new engine. I need to add 3.5" to the rails to accommodate the slightly differnent motor mount locations of the new 3 cylinder engine vs the old 2 cylinder engine.