I have a 71 skylark that is an original a/c car still has the original box on the inside but but the fiberglass no a/c on the firewall side. I’ve mounted the blower motor and reostat. Question I have is I would like to run the non a/c control panel in the dash. Has anyone done this and know if it’s just as simple as changing the control head and cables to the non a/c type?