Craigslist and other sources I would look into a running 470 that would be the best way to go.It's not the fresh water system killing it. More riser bad operating when lower in coolant (steel head aluminum block) just a few reasons. Actually it boils down to general maintenance.  
     So that leaves it hard to fine a good one. Most of the time the good ones are usually in a boat that sat for years and rotten out. Maybe consider closing the transom hole go bracket and outboard. Ten thousand for a new 3.0 litre is out. I have two of these boat with the same motor that still run fine for now. Good luck with your decision.
		 
		
		
		
		
		
		
		
		
	
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