smallest 6-rib pulley that will hold ?

hey guys ok the motor is broken in as well as the clutch...

i just ordered a paxton fmic and 3.125 pulley

i think the 107-1/8 " belt will work with this pulley

whats the smallest 6-rib before slippage....

and what psi are people seeing with this pulley ?

i think the lose with a fmic is 1-2psi ?

500rwhp is my goal..