The system was dry because all of the suspension was removed to put in new bushings, ball joints, etc. Then the project went into limbo. A new master is $140 and could be money well spent.
Bleed screws are at the top of the calipers, both front and rear.
I will bleed it again and use Marlin's approach of getting a firm pedal first.
I am wondering why those check valves are there. I have never seen them on another Pantera.
I verified the check valves are installed in the correct direction.