[Woj]

FWIW,

I used a repop master cylinder on a past 69 Chevelle project, bench bled the heck out of it and never got a pedal. Put a rebuilt on in, bench bled and it worked like a champ. There is a chance you might just have a bad MC. Try another from a parts store (they are cheap). Or, maybe your old one if it worked.

Good luck.

Phil Woj.