The Stealth head suggestion has merit; pump gas will limit your CR anyway. Might go with a better dual-plane intake. A good 2.5" exhaust. More lift, not more duration if you plan to use the A/C and have decent throttle response and street manners: something around 224/234 @ .050 with .500/.525 lift or so. Look at Engle's website. I would not run the MP 284/.484 cam unless you have a loose converter. CR, duration, and converter need to work together.