had a 79 80hp good motor ran great. but look under the cowl for bad wires. an if oil injected ck. for oil leaks.as they tend to get old an crack. thus the blown motor good luck
if you put in pdc use the marina ramp. you can go north to the sand pit.an fish there an not get close to the chanel.fish around the poles they tie barges to. good luck
if you know where its at get an old metal stringer put a good length of mason line on it open all the hooks an drop it over worked for the kids fishing bow good luck
dont know much about 4sts but if you think its the head gasket take a comp ck that should tellyou if that is the prob look for low comp on a cil good luck