i just got this boat with a 454 all stock and a 12je with I believe a 'a' pump but i put a hei,edleblock performer and holly 750 with vac sec on it.Something doesn't seem right i was running 4200 at elsinore with the stock intake and dual point dist and a 750 that was in bad shape replaced everything and went to silverwood which is a lot higher in elavation and only ran 4000 but at 48mph.The motor is a fresh rebuild with only about 20 hours.Just looking for some advice don't know if i have a bad tach or boat is just to heavy or motor problems.Set the timing at about 12 and have the lightest springs in the dist and runs great just looking for more topend.I bought the carb used and don't know what jets are in it or what i should be running.thanks