I'm hearin that it ain't been right since day 1. I'd (1) set the pushrod clearance to ~.020 (2) take off the MC lines & cap the MC ports with a pair of brass male inverted flare plugs from the Edelman cabinet at your parts house (they're cheap & you will reuse em in the future) (3) eng idling, if the MC is good & bled out & booster functioning, the pedal should be rock hard with virtually no travel. that'd be a start (& the MC/booster is the beginning)