ABS brakes won’t bleed

I have an 89 NA that I am trying to wrap up my LS2 conversion. I bought this car that had been sitting for a few years so it was not running when I got it. It has ABS brakes. I have bled the brakes with a power bleeder 5 times. I took the master off and bench bled it. I even plugged both ports on the master and that was the only time the pedal was solid. Otherwise, the pedal goes to the floor. It will not build pressure no matter how much you pump it. It acts like it is trying to build pressure, but it never does. I hate bleeding brakes and have been doing it for 3 days straight. Any ideas old be appreciated before I blow my brains out.

Sorry but I got a wrong part and didn’t realize the front caliper bleeder valve was on the bottom. Caliper was full of air. Feel like a dumbass. All good now.