Mushy brakes 4 life...

Replaced 100 or more,bench bled every one. As per manufacturers instructions.
I still dont think drum is the issue.
Crank brakes up tight with adjusters and try pedal. Zero clearance should mean hard pedal.
Backing plate rubbing in only one spot,plates bent?

Soft pedal,maybe reverse bleeding. Pressure bleed from each wheel pushing fluid up to master. I have never had to do this,especially on domestic. 75%are usually successful just gravity bleeding.

I hope you are just kidding. With the rear wheels tight, you cannot turn the wheels. Period. Period. So yeah the drums are the first issue. Did you see the pics where the paint has been burned off and the backing plate friction? It’s more than a rub. It’s hardcore into the backing plate. Both backing plates are rubbing in about 4 spots very consistent to each other. Unlikely they are both bent in the exact same 4 locations per side. 28 bench bled master cylinders on the car will not fix this issue. Again I appreciate the comments and suggestions here... I really do... I just think some are reading the title and replying. You might have to scroll up a little to get caught up. Metal on metal has absolutely nothing to do with Pascals law here.