my 2 cents..dont under estimate what u already have..thats a very gd motor..alot of people are running the Edelbrock RPM manif..u might want to ck that out..Holley 850CFM..is great..u might want to call some of the cam manufactors and talk to there tech rep's..i personally dont think u need a roller cam..a gd ign wont hurt..as far as the bottom end goes..i would pull a couple main caps off and look at the bearings..then decide what u wanna do..remember the motor only has 5000 miles on it..not even broken in yet..in the boat u have with the jet and impeller..it should fly
if that motor is a tall deck..u need a manif that will match...good luck..keep us posted
Ron