Found: 1970 Dart Custom GT A65 code Burnt Orange 318 3 spd on the floor

Me too.

Even the somewhat oddly optioned, otherwise "run of the mill" cars.

...like my almost no options including no carpet and no day/night mirror, but A/C '73 Satellite.

I've seen one other optioned the same.

Might be some kind of program car, but no program car code on the tag.