There is a floating caliper which is steel but comes with a cable operated parking function. It does not weigh much more than a caliper wo the ebrake. GM
Speedmaster has an aluminum caliper setup with integral parking brake. Single 1.75" piston. Fits 11" rotors (not included). Fits Ford 9" rear end with "small ends" (Torino). I have no idea whether that's what you have, but you should be able to figure it out with a few measurements. https://www.speedmaster79.com/BRAKE-CALIPERS
Speedmaster also offers a "Ford Late Model Large & Small Bearing 4 Piston 12" Rear Brake Kit". Aluminum calipers and mechanical drum parking brakes. Drilled and slotted rotors. https://www.speedmaster79.com/Ford-L...Rear-Brake-Kit