A 115 ETEC would be plenty. Terry England of CC has a 25 bertram with twin 115ETECs that runs great. It is about three times as heavy, a lot wider and deeper than a twenty. I had a Seafari 20 with a 150 Black Max that was much faster than I needed offshore. More than plenty of power even with 3 divers, 10 tanks, extra fuel and several hundred lbs of ice and fish.
With a bracket, any engine will be hard to zero in for low speed planing. You will probably have to experiment with props. See Bushwackers posts for the best insight.
Good luck with it!
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