r/t b-bodie question

I need some help on a car. I am looking to buy a 71 charger r/t. My only concern about the car is the brake system. The car has 4:10 gears and I assume that means super track pack. I thought the power disc brakes was part of the package. Did all the r/t cars have pdb? The car is a 4-speed dana. Any help? Thanks
Author: indy dart