i have a 22 foot pontoon with a 1973 4 cly 65 hp 4 cly two stroke i need to konw if the prop is wright it has a 14 x 11p merc, prop it seems to run good but being my frist pontoon i don,t know i took the rpms up to 5200 but it seemed high so i backed it down to 4000 am i in the ball park with...