Oddball 1970 Dart GT Find....

Built at the Windsor, Ontario plant?

They had their own F code system. I am not aware of anyone that has figured them out yet, but they are not the same as the F codes used by other plants.

That sure sounds more plausible.

If you are parting it out cut the headliner and take a picture showing the reinforcements.

How about a picture of the fender tag and build sheet? It may help others decode those F codes at that plant.