I have an 85 SE. The previous owner stripped out the heater and a/c system intending the car to be used for track only. I want to put all the stuff back in. I have the dash with the vents in place. Behind the vents is nothing, even past the firewall. No ducts, controls, wires, core, hoses, etc. I'm on the hunt for a used system, but I'm wondering if there are some pieces to make sure I'm getting, that might otherwise be easy to forget. Also, what models can I get this system from besides other 85 SEs? This job is going to be horrible, I know it.

Interiorwise, I'm seeing:
-Heater Unit
-Blower Unit
-All the ducts
-Cables and controls

Other side of firewall, I'm not so sure besides hoses.