I have recently purchased a boat with what Im told is a 70's model (possibly 76) merc 4cyl 65hp outboard. I dont have the boat yet but Ive been reading up on the older motors. I notice that Mercury apparently made a 65hp in both 3 and 4cyl versions around the same time. Does anybody know for sure if mercury made outboards with 3 and 4cyl versions in the same years with same hp? Is there a particular advantage to one over the other? <br />Thanks much