I'm 99% sure it's factory A/C. It has the factory controls for A/C, factory A/C box, all the holes in the firewall for factory A/C.Any chance it wasn't a factory a/c they swapped in to make it one?
Personally I wish it was a heat-only car. Cleaner looking dash, cleaner looking engine bay and less stuff I'd have to fix.
It has been a while since I've read it, but I believe John DeLorean mentioned something about them shipping the Vega on end in "On A Clear Day You Can See General Motors".I watched a video on that, pretty cool but likely a wash when it was all said and done.