I have a 67 camaro, that came out with a/c that I am trying to restore. Im restoring it back without the a/c. I bought the a/c blockoff unit that goes on the firewall and I now have my underdash ready to go in place. I just assumed I would use the original heater/ac control unit and leave the ac undone. But now that I am attempting to hook it up im realizing that my wiring harness may only connect to a non a/c control unit. If I buy a non ac unit will I have anymore problems? Will my cables that control the doors on the vents hook up the same or is this the beginning of my troubles?