Brake Bleeding Issues!

I Replaced everything on the brakes. New Hard Lines, Propotioning valve, Hold off valve, rubber lines, Master cylinder and wheel cylinders. I got all lines and valves from Inline tube. I have factory disc up front (Kelsey-Hayes) and the master cylinder is a new style master (with the adapter from 4 bolt to 2 bolt mount). I bleed and bleed and bleed again. Still i push and goes to the floor. I gravity bleed for about 2 hours. I got fluid out of all bleeders. I pressure bleed with the powermotive bleeder thru the master. I bleed with an Injector bleeder from the back to the front. Still to the floor. Pedal will pump up after about 5 pumps. I only have front brakes. I put the car in gear on jack stands and put it in gear the back will not stop no matter how many times i pump the pedal. Help!