[SkunkBoat]

My V20 had a Merc150 2 stroke when I bought it. Topped out in the mid 40s which is all you need for ocean running. As said before, its rare to be able to run faster than 30mph in these light boats with any kind of swell. For me there is a 1/4 mile stretch of the river on the way out&in where I can go balls to the walls.

Replaced it with a zuki 140 four stroke (there were no 150s until the next year...)
The 140 topped out in mid 30s, got great gas milage, trolled at 2mph at idle speed(Quietly...without fouling plugs and choking you to death!), towed tubes and kneeboarders.

I think a 150 four stroke is the perfect ocean motor for these hulls. Lake boats could make use of more HP more often so maybe a 175. I wouldn't pay up to get a 200.

Now my Grady265 is a lot heavier, Twin 225s and I can run 40mph in stuff that would slow the V20 down to a crawl.
I've run a 23cc SeaHunt with a 250 that had the weight to run hard too, but you got wet and you tended to bang your knees on things...