I have a 1988 4 Winns boat w/ a 260 HP 350 (5.7L) Mercruiser engine that needs to be replaced. (All the accessories and exhaust manifolds appear to be in good working order). I want to repalce this older 350 (5.7L) engine with a LATE model 2002 5.7L Vortec Marine Engine. What must be done to...