My 70 Challenger had drum brakes which I converted to 73 disc brakes because I had the parts. My 71 Barracuda has factory 71 disc brakes. If I had the options available now, I'd go with any 11" to 12" disc brakes. I have a kit to mount disc brakes on the back of my 71 Barracuda, but I can tell you from owning a 98 Dakota with rear drums, the rear brakes don't do a lot for braking as I only replaced the shoes two years ago!