Brake question

[bugsy]

I had some issues with not being able to get brake fluid to the rear brakes for our 70Z. I had the master rebuilt, the boostercleaned and new diaphragm. Front calibers rebuilt, rear wheel cylinders rebuilt. Combination valve rebuilt, all lines cleaned out and flushed. Put everything back on, bench bled master cup. Hooked my vacuum bleeder up and I get fluid and air. Gravity bled all 4 corners. Pushed the brake pedal in with a piece of 2x4 under the brake pedal. Pedal still goes down to block of wood and I can hear the rear drums move. Soft pedal thinking I have air in the master?No leaks anywhere. Anybody ever have this issue. Think I'm missing something. Any help is very much appreciated