the 049 heads would be ok but heavy. to do them up you may be better with a new set of alum O port heads and there would be less weigth on the transom may help get the boat on plane .better short side radius on the ex port just a better head .but if you do not have the coin the 049 would work . you may not see any thing if not prop out right . how do you know the heads are to big ? i put two sets of 049 heads on a 39 foot stinger the boat run about the same it had rect ports 375 hp engines in it heads were crack so i used the 049 heads with stock size valves