Air in brake lines

[Rob Webb]

So I have done a frame off restoration. The last thing to do was bleed the brakes. All new brake lines, new Wilwood Master cylinder, new wilwood front calipers, rebuilt the rear drum with new wheel cylinders.
I bench bled the Master Cylinder, When I installed the Master and have the proportioning valve plugged off I have solid pedal. I have no leaks and I can not stop getting air out of my brake lines. So now I'm splitting off. I have the fronts plugged off and trying to get just the back brakes bled I keep getting air.
I have used a Motive pressure bleeder, A hand pump bleeder from Harbor Freight but still air? Any suggestions? I did not use any Teflon tape? All new hoses, etc
Thanks