I want to by a used boat and have run accross two that i have to make a choice of.<br />one a 1986 17' with a 4.3chevy ome outdrive that had a overheat problem that they fixed. it runs good now, about 40mph with three men in it. The other is a 1988 18' crestliner with a 3.0 merc and a alfa 1...