don't over think it or over complicate it, if its on a boat, it will break, the key is making it so it won't break often. Take a picture of the heat exchanger(or your existing heat exchanger) to a radiator shop(big truck radiator shop) see if they can make you one that's larger in diameter, your existing one is referred to a 3", the later models had a 4 ". It would be interesting if a 5" one could be fitted. Try using cardboard tube, pvc or anything that can mock up the heat exchanger on your engine and see how big you can get away with
K.I.S.S. principle Keep It Simple Stupid!
and no, I'm not calling you stupid
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