If you're going "vintage" power for that boat, I'd highly recommend either a 90 or 115 HP Mercury in line 6 cylinder "tower of power". They're both essentially the same engine and at right around 300 pounds they're relatively light for the power output. The later versions (they built these up to 1988 I believe) had electronic ignition (no distributor) power trim, stainless drive and shift shafts and a more streamlined gear case. Nothing else sounds like one, especially at speed. My nephew has one of these boats with a 90 Merc and it handles it well. The 4 cylinder 80 / 85 HP engine was also a good motor back in the day.
If you can, please provide picture updates of your project as you move through it, I'm sure I'm not the only one who would like to see it. Good luck, sounds like a fun project.
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" Any day with a boat ride in it is a good day"
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