Well, ill take a stab here.......if its an outboard......well, you can put anything back there you like. 
  
If its an I/O, well once again, you can put anything IN there you like. And whoever has the boat, wanted the 3.7. I am fairly certain wellcraft didnt list a 383 stroker motor as an option either in 1988, but thats what ours has in it.
		 
		
		
		
		
		
		
		
		
	
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