It depends on what size your talking about taking off and if your converting from drums to disc brakes or not
If your switching from 9 inch drums to the later model(1973 to 1976) A body disc brakes with the big bolt pattern you will need the upper and lower control arms with the ball joints, spindles and all the brake mounting brackets, hardware and disc and calipers mounting bolts and switch to a proper size for your car disc brake master cylinder I did this on my 1971 Duster with the early small bolt pattern disc brakes, I swapped the passenger side to the drivers side on the later model caliper mounting brackets and brake calipers to get that heavy weight single piston caliper behind the spindles