Sorry, I just don't think an inline 4 cylinder is going to perform in real world conditions at any satisfactory level. 200 hp is pretty marginal for ponies on an offshore hull rated for 500 hp. Maybe a bay boat it is fine but you have to think about the torque needed to hold plane in seas and the overall requirements for load on a day offshore. Would it work... sure but it isn't going to be impressive at the least.
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[b]The Moose is Loose !
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