I have a 1969 85 Hp Evinrude. Its tuned well and runs fine. Its mounted on a 18 ft crestliner, 1974 model, deep v, approx 1000 lbs weight. its a big water, deep draft boat. Right now I am running about 30 mph, trimmed up with one aboard, at 4600 rpm. I think its running a little hot as powerhead...