Power/Manual Brakes?

I recently rebuilt manual KH disks and 10 rear drums on my 1967 Dart. They feel great, and stop the car well without a lot of effort. I wouldn’t add a power booster, it is not needed in these light cars.

I can tell you this; if a few pistons are stuck in KH disk brakes, the pedal becomes real hard requiring a lot of effort and loooong stopping distances.