Need brake help, again

[BigRed76]

This has to do with the brakes on my '72 Cutlass. Its still GM brakes so i figured i could get some help with this.

I recently did an engine swap on this car, and that is where the brake trouble began. This used to be an all drum brake car but was converted to disc in the front so it has the distribution block on the frame below the mc. When putting in the new headers i had to remove the distribution block to get the header in, and then i reinstalled the block afterwards. I Then bled the brakes with no success (Excessive pedal travel & weak brakes). I then found a pinched brake line underneath the oil pan causing a restriction. I replaced that line and bled the brakes 2 more times, this time getting steady streams of fluid at all 4 wheels. But...there is still excessive pedal travel and the brakes do not apply until the pedal is nearly to the floor.

Could there somehow be air trapped inside of that distribution block?
Am i skipping something in the bleeding process?

Any input on this would help me greatly.