If anything, that boat is overpowered. Perhaps underpropped but certainly enough horses.
GulfStars are very efficient hulls. A pair of 90 hp engines would be enough. Or maybe one 120 hp diesel.
S.D. hulls will not go fast. period, point end. You could put a couple rocket engines in it and it wouldn't change anything.
(P.S. Here we go on a discussion of power, props, single vs dual engines, anchors, etc)
pete
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