Manual Drum Brakes info needed!

Check the wheel cylinders, they may be rusted up internally. Jack up car, have someone apply brakes & see if you can turn wheels by hand. Even with light pedal pressure they should not turn. I recently bought a manual drum B-body that had exactly the same symptoms as you & it had 2 frozen cylinders, solid rust inside. Properly set up manual drums should stop straight & true with only moderate pedal pressure. They actually have much better feel than power discs of same vintage. You can still get USA made wheel cylinders for cheap.