Rear Brake Dilemma

Generally speaking the /6 cars got 9" drum brakes and the V-8 cars got 10" brakes.
Since that is the case, an 11" brake drum had to be drilled for a 4" bolt pattern to fit on an A-body axle. Or, the axle has been converted to BBP. It's not a problem unless the front has not been converted and the problem is carrying spare tires to support the car.