The heads are the undesireable smog heads, a car rv cam is smaller than the stock jetboat cam and the streetmaster intake is a 70s bandaid. SORRY Get a performer rpm or rpm airgap intake, port the heads or replace them with a better head and port those and add larger valves. Cam; call me with the rest of your combo and I'll recomend one. Also, if the cam was not degreed in and you have a stock timing chain setup, the cam will come in at 8 to 12 degrees retarded, this kills the midrange torque. Call and we'll go over it. Also; rpm in a jet is independant of load of passengers, the rpm is a function of impeller size and HP. There are other factors, but unimportant in your case. TIMINATOR