used closed cooling system...just the heat exchanger will cost 200 to 400 bucks. and used come from common sportfish engines. 454 inch 330 hp. I am gonna get one for my 350 small block that will spend the summer tied to the dock in jersey ocean water, but for something with 10% more displacement and 30 to 50% more power than the engine it was made for I wouldn't think a used crusader-mercruiser setup would do the trick very well.

OP,

http://www.keitheickert.com/c-1527-c...ling-kits.aspx

PM me for a quote.