I have a 406 sbc I took out of my ski boat. It has 882 heads (1.94/1.50) with a 3 angle valve job and domed pistons yielding 10.5 to 1 compression. I reasoned that with the constant flow on lake water, the cylinder temps would be ok. What I didn't take into account was the heavier load on the engine in a boat versus a car. I don't want to put new pistons in it, as it has few hours on it and the rings are seated nicely. I know a cam with extra overlap will bleed off some compression, but I am not sure where to start. It has a performer rpm intake and cam, but the cam has to go. I ran premium in the boat, but I had to run the timing real light to avoid detonation. Can you guys suggest a cam that will produce good power on the street, yet be ok with premium fuel? My plans for the engine are for a 3000lb car, 3.42 gears, and 28" tall tires. 5 speed manual, no automatics for me! Thanks!