Found this, to much for me, but

66340SEDAN said
Did anyone notice that this may very well be a Mexican built Duster? Check out those hood scoop emblems, hard to make out but I think those are those Mexican "318" ones....also, a 4-speed was common in these cars.....notice the hood scoop has the hood tach bolted to the scoop? That's original for these Mexican built cars with both of these options. They never had a 340 though but engines come and go over the years....this actually might be a pretty rare car.

Totally. When I saw the inner door panel emblem with the hood emblem I thought Mexican Super Bee.

There's a guy in Ventura that has a Mexican Dart GTS and a Valiant Super Bee. I've posted pictures here of them before. Looking at the backgrounds it could be one of his.

And those Mexican cars get very hammered down there. Which is indicative in the pictures. In Mexico, THAT IS A SURVIVOR.

Now that I see the pictures. It surely 100% from Mexico. The clues...

No heater motor
Non US wiper motor. Totally different than anything here.
Inner doors cut for emblems on a 70 up duster non-vent door (never in US)
Hood Tach
Scoop emblems
70 wide horn button wood wheel. Horn button is 70 B-body only, not common to swap on. If you enlarge picture, the button doesn't look exactly like US button.
When you enlarge picture there are no controls in the dash heater panel. It's blanked out.