Picked up nice 1988 Marathon Weekender that was not properly winterized. The engine block is cracked. I was wondering what year group of 305 engine to get for a donor block? Also have been interested in maybe getting a 350? Do I need to use the 305 heads or can I just get the proper cam grind and brass freeze plugs on a 350 and rebuild the rest normally? I have also seen several performance intakes used on ebay, would one help in a marine application? Seems like it would not. Thanks for any advice you can offer.
