Get the `70 to `73 single piston brakes and be sure to use the 11.75 rotors on that heavy car. You will need the bendix disk brake booster too to make it work right. Get a matched set of sway bars and you can upgrade the torsion bars to the 1.06" 1974 chrysler units that came on wagons and some other HD applications. Do not use urethane bushings except on the sway bars unless you want to ruin the quiet smoothe ride that we buy these big cars for.