My 20 seafari had a Merc Black Max 150 from the mid 1970s on it. We massively overloaded the boat most of the time(3 divers, 10 tanks, 150 lb ice and bait, etc, etc) and the 150 was plenty of power. Most of the weight was midships to forward, so tail heavy wasn't a problem.
You can do with a lot less power and Gillies comments on engine weight make a lot of sense.
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