You'll want 80% to 100% of what the hull is rated to handle.
Ayuh,...... My personal rule of thumb is 80% to 300%,....
My Starcraft 221 Islander had a 140 hp that did 28 mph on a Great day,....
I dropped in a 205 hp, 'n now she'll do 43 mph any day of the week,....
My little ole Glastron Jet-Flite was rated for 60 hp,.....
At 1st, I bolted on an 80 hp, til I blew it up,....
Then went to a 135 hp tower of power,....
That little boat, literally
Fly's,....
This is with the ole 80 hp, 'n an 11" pitched prop,...
Hada pump the throttle to Wot 3 times to get it to Jump outa the water,....
Later with the 135 hp, 'n a 21" pitched prop, it did that every time I mashed the throttle from an idle speed,....
Power trim finally tamed it into a sweet little water Rocket,...