bolt pattern disc brake q

Must be a manual brake, /6 car built before January of '76. Or it's been swapped before. Starting in January of '76 there was a federal mandate for front disk brakes. And starting in '73 every V8 car got disks (and therefore the BBP). Even a lot of the /6 cars got disks after '73, power brake cars got them, towing package cars got them, there were a few other options packages that would upgrade the car to disks even if it was a /6. My '74 Duster was about as plain jane as they get, /6 and almost no options, but even it had the BBP disks.