brake bleeding problem

[dwlambert1701]

OK as mentioned before I'm restoring a 1963 Chevy C10. I replaced all the brake parts, Wheel cylinders, springs. pads, brake lines and replaced the old single bail master cylinder with a dual bail master cylinder. Now I bled the master cylinder before I attached the lines. Now I'm trying to bleed the brakes lines and I'm getting nothing. Well I'm getting air bubbles from the front left but nothing at all from the rear. The Bleeding method I'm using is connecting a hose to the bleeder and the other end is in a clear bottle half full of brake fluid turning the bleeder valve while someone presses the brakes.
I also still have drums all the way around. The master cylinder I bought is for a Disc/Drum Application could this be why as well.