Strange that I missed this thread before. I'm going through something similar with my Maverick. I have (had?) factory "GM Metric" front calipers and Ford Racing 11 x 2 1/4" drums in the rear with a 15/16" bore Grenada master. Car always had a high hard pedal but very poor stopping, which made me leery of driving it. In search of some actual "braking", I swapped out to the Wilwood 2.75" bore calipers and now my pedal goes straight to the floor, out of fluid. I can get a pedal by pumping it several times, but that won't cut it on the street. Just ordered a 1" bore master and will see how much pedal I will get. BTW, that caliper change is a 34% increase in piston area per side!