You'll get really good power by running open chamber heads (120cc) and lower the compression down to a ratio that will run cooler, run on 87 if you keep the time 6*-8* btdc, you'll make up for the compression loss by having better flame travel (flame propogation) across the top of the piston, AND you can run a high torque cam and have it really work well! Unless you got a mass of money to burn don't go the way of the gear drive cam timing sets. The idler gears tranmit torsional vibrations (why you have a harmonic dampener) that you don't want in your engine...up to the cam, the consequently through the lifters. Run a chain or drop a hunk on a Jesel equivilent belt...but, personally, I won't run a PJ style gear drive.