1969 Dart Street/Strip (Re)Build

Yet another problem with a new part. Tried to bleed the brakes and could not get the brakes to firm up. Bled and bled and bled. Nothing but a pedal that goes to the floor. Took the master cylinder off and it was leaking around the plunger. Put it on the bench and attempted to bench bleed it. Damn thing was sucking air somehow and the lines would never clear. Bad master cylinder turns out. Brand new from Dr Diff too. Now I look on his site and he's out until the 18th. I am left with no choice but to find a replacement from elsewhere. All I'm saying is the guy better refund my money. So sick of all these new parts being total ****. It's getting old.