hi all i know i keep banging on about engines but im almost at the point of buying a evinrude 90hp v4 for my norman 20 but ive been told by a very wise and gnarly marine enginner that its too heavy for the boat ive modified the transom with 3mm stainless plate on both sides as the main transom was still solid and not rotten any imput would be great before i take the plunge