Brake Changes on A Bodies

Hey guys. Is there a knowledgeable fellow in here who could tell me what braking systems were standard in A Body Mopars and at what times? I have a 1974 Dart Sport, drums all around. I don’t know if it’s the 9” drums or if it’s one of the 10” variants. If it helps, it’s a slant six car with a 7.25” rear end