I bought an 87 glastron with a 5.7. I was made aware of an exhaust manifold that needed replacing. I heard the motor run seemed fine except water pouring from manifd I relaced said manifold. Motor would not turn over. I removed dipstick and it is milky white way above full level. I removed spark plugs and two cylinders had same milky oil run out of them. Have I wasted my time? Boat was cheap. Is it scrap? Lower unit trim and tilt work fine