x2 on the headers, you won't go much further with the pulley without them. it's a really delicate balance, basically you want both. keep in mind boost pressure isn't really what you're looking for, you want air flow, and you want to ignite the charge at the right time, not necessarily earlier. i would say start with the pulley and find what your timing should be, then put a bigger pulley on and adjust timing, and find what combo nets you the most power. keep in mind timing advance has to increase as engine speeds go higher, and small amounts of knock at higher rpms are like high knock at idle. don't be afraid to back out of the throttle if you see it
