A body brake pedal ratios ???

The brake pedal ratio was the pretty much the same for all of the A-bodies as far as I know, it’s ~6.5:1 based on the pedal. Power and manual brake pedals weren’t different, just the length of the push rod because of the booster. There is probably a slight overall ratio change because of the booster linkage, but that’s not at the pedal.

Automatic and manual transmission cars had different pedals, but the same pedal ratio for the brakes.