Figure on 35 statute mph with a strong 90hp. And cruise at 23. An older etec 90 is pretty light. Not sure many 4 stroke options are lots less than 370 lb. I have one but if you are at 380 lb now, I'd move batteries forward first. If you do fiberglassing then I would foam core the fuel hatch, too. Those are labor intensive ways to fix static trim that are relatively inexpensive.
If I had the money, I'd change from my Yamaha F100 to an etec 90 or look at that mercury 115 four stroke.
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