I am still working on getting the math right for this brake system. I hope you guys can help me finish figuring this out. I may try to use the OE style stock replacement master disc/drum (and remove the residual valve for the rear) along with the stock style booster and see if I get enough pressure going into the gm style rear calipers. I am not opposed to changing the MC but I may as well try the one I have since I've already bought it.

Since this will be a "driver" I want to stay with power brakes if I can.

Front:
Single piston caliper with 2 3/4" bore on 11" rotor

Rear:
Single piston caliper with 2 1/2" bore on 11" rotor
*have manual valve inline to adjust bias

The best I can calculate, it seems ideally I would need an MC with 7/8" bore. I am not sure what the bore is on the stock style MC.

The calculations show I will need pedal travel with 8:1 ratio.

Any help will be much appreciated!

thanks guys!