I see nobody has answered you so I will take a stab at this. My 71 was born with AC but someone converted it to heat only and I recently converted it back to classic auto air AC/heat. When they converted it to heat only, they changed out the heater core box (removed the evaporator box and replaced it with a heat only unit from a junker). There were some wire plugs (still are) that were not being used under my dash that I think were from the AC days. I guess what I'm saying is that you will probably only need the connector that goes to the fan switch and the one that goes to the fan motor. I believe the non AC fan is smaller in diameter and the hole in the firewall is smaller. I say that because the previous person had a goofy adapter plate inside behind the fan motor and when I went to install the classic auto air block off panel, it was too small and I had to fabricate my own. Oh, the fan plug for the heat only had 3 wires. A light green, dark green and a brown. I have that switch and the 6" harness if you need it, I can send it to you for free.
