rear disc problem Dana 60 rear

I wonder if anyone is familiar with the older Master Power Brakes rear disc conversion that is used on a Dana 60 rear end.
I had a local shop replace the calipers and pads and they cannot get the air out of the system. The rear calipers are from a 1979-1984 Eldorado. Does anyone know how to bleed these calipers. I will probably have to have the car towed home and fix it myself. I know they tried to bleed the calipers by holding them up off the rotors but I don't know what else they tried. I think I'll get a power bleeder and try that. Any thoughts?
Thanks,
Doug

Are the bleeder screws at the “top”? If not, swap sides or use a block of wood and have the calipers pointed so the bleeder screw is at the top.

Take them off,take the reservoir cap off and keep it full,open the bleeder on one and tip it back and forth.Bubbles will come out,keep doing it till no bubbles.Tap on them too while doing it. Then install and do a normal bleed.