Brakes not working

Helping a club member with a brake upgrade. He upgraded a 72 barracuda from 4 wheel drum brakes to front disc and rear drum power brakes. The entire brake system has been replaced. After market front disc kit (rotors, spindles, calipers, pads). New brake lines/hoses, master cylinder, booster, brake pedal linkage, reinforcing bracket, power brake combination priority/distribution valve. Having a hard time bleeding the system. Firm pedal when bleeding but pedal is soft and goes to the floor...

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Author: rrod