I need a 8-10-12 psi 6 rib pullies for P1SC

I want to try a few different pullies on my P1SC procharger. I have a 3.55" on it now, and it makes between 4 and 6 lbs of boost. I have copper intake gaskets, O-ringed the 76cc AFR heads, put in a set of Wiesco forged slugs, and balanced the Eagle rotating assy. All of this is in a 1995 GMC Sierra. it is running in the mid 13's with a best time of 13.31 @ 103 mph . I just want to see what kind of difference changing a couple of pullies can make. I don't know what size pully I need for each psi level. I'm sure that the motor will take most anything that the P-1SC can put into it, but I don't want to go too Xtreme with it yet. Any advice will be a great help. Thanks