forced induction psi standard 440?

A good friend has an 871 on his 440 in a 72 Cuda. Seems he told me that it was 8.5-1 compression, standard 72 block with stock forged crank pushing 10-12 lbs boost, 2 Edelbock 680cfm carbs. and crane blower cam and mildly ported 906's. Cuda runs high 10's 1/4 blowing the tires off at launch. Great thing about it he drives it to the local street meet every Saturday evening. Very streetable