Re: To Rebuild or not to Rebuild that is the question
At least change all the fluids before going any farther. Overheating cooks engine oil and coolant.
A compression test would be the next step.
Then read Porfin's as yet unfinished thread about re-building his 4108.
If a fresh engine is needed, definitely rebuild it - a swap is a huge job and will cost WAY more than the already shocking cost of a new crate engine - 30%-50% more if you do everything yourself, probably double if you just write cheques. Either way a new crate engine, installed, will cost as much or more than your boat is worth.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.