You used your original heater box what are you using for the rest of your A/C. What controls. Mine was an A/C car but have nothing on the interior but heater box and heater switches.
I'm using all the stock interior AC parts. Original heater and AC evaporator box. Using original vacuum controls. Using original evaporator freeze up protection thermoswitch.
Will get a new drier and new expansion valve and new hoses and hard lines. I'm going to install a hi/lo pressure switch and wire in series with the AC compressor clutch to protect compressor.
Using a new Sanden rotary compressor and new larger condensor. If you have more questions - let me know