If the boat is light then you will be surprised at the performance.
I run a 2005 yamaha 115 carb'd engine and i cruise 25 - 27 mph at 4200 RPM. WOT with a light load i can touch 35 mph on flat water.
The engine will be mounted higher than you think it should be. Mine is mounted a little over 1" ABOVE the keel and i wish i could go higher but i'd have to re-drill and dont want to do that.
Fishing 3 guys on the boat with gear takes maybe 2 mph off those numbers and doesn't affect my boat planing at all. I've yet to REALLY load it down, just haven't had the need but i think the performance would still be adequate.
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