Holes in the firewall ???

70 Dart, when I got it it was a bone stock slant 6. I’m guessing that these are ac holes but my entire heating/ ventilation system including controls
Do not include ac. The holes are cut extremely clean as if done by the factory. Is it possible that the factory cut the holes and they were never used???
Any ideas???

2463688C-A46E-4873-9CFD-A19157901340.jpeg