Little help ID-ing this 340 wedge

Is that in Missoula?

Not a 340 car. Slant six.

VL29C1B183928

I think you have your answer. A 1970 duster h-code car should have twin body stripes down the center of the sides. That car has what I would call "Gold Duster" stripes.

Other things/clues it would have are a rallye dash with 150 mph speedo, the rad is as wide as the opening on the front, a passenger side bolt on exhaust hanger bracket for dual exhaust (the driver's side is welded) this bracket is located forward of the gas tank, a flat washer welded to the front of the K-member, front disc brakes, stainless trim on the roof drip rails, front sway bar, 8.75 rear.

Also the 340 "wedge" decal started in '71. So I don't know if you can really call it a 340 wedge. But the wedge refers to the cylinder heads and all 340s had wedge heads, so go figure. Back in the day there was some idea that the 340 wedge decalled cars had a "special" 340 and were faster, but we now know that was not true. It may have been more of a case that the wedge decal V24 cars tended to have more options, so they would be more likely to have 3.55 or 3.91 gears which would make them accelerate faster than the 3.23 cars. Just my opinion anyway