Holes in the firewall ???

Brooks James said

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???

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From your photos we can't see where the holes were. There was talk about dealer installed a/c. Do you have any traces of A/C? THe factory didn't punch holes for dealer installed air. Just for factory air. My 70 Swinger has hoses that go through the firewall below the blower motor. They are crudely made holes sealed with a/c sweat tape.