First- Thanks!
There are some things that are an absolute "must" when running a blower. You have to run a forged crank, forged dished blower pistons, fluid damper, and a cam built specific for running blowers and turbos. You can't use a stock harmonic balancer, this is dangerous. They will fly apart!! For 7-9 psi, you will have to get 12% underdrive pulleys. I'm running straight 1:1 drive for 15 psi with no problem, but if I get even 1 deg. adv too far on my timing, I can blow a head gasket. For the heads, you need a good flowing pair, with some porting done to the exhaust side. The carb (or carbs) have to re-jetted. If you run the engine lean, the pistons will melt and your headers will glow bright red. If you need any part numbers, let me know. I get most of my stuff from Summit racing. Since the blower is used, have all of the clearances checked. Also, run a screened gasket between the carbs and blower, this can save you from a major headache if something falls into the carb.