i have a 460 .30 over that was internelly balanced roller rockers. i am looking to put a cam in this motor the engine info i have says it has a hyd hi perf cam but this thing doesnt lope. i am looking to make this motor lope good, nothing dangerously big but i want it to sound good. it has the over the transom headers (jet boat). any help out here and if you are in the menifee area how much would you charge to install this cam thanks in advance rich.