I know the car and its owner Scott. Scott is a B body guy, iirc he got that Challenger a while back in trade for a boat but as a B body guy it wasn't his cup of tea. It is a real R/T 383 car, I don't know if it's #s. I can tell you it is for the most part a 10 footer. I believe it it is rust free, but beyond that, it isn't a very well restored car, you can see the 70 go wing from the ad pictures for example, and under the hood and in the interior there is as much incorrect as correct.
It's probably a decent enough driver to take to cruises, update things here and there as weekend projects, but not a show car or Mopar Action "reference restoration" by any means. If the price was right, which might be mid to high 20s and that is what you are looking for, take a look at it, otherwise pass.
But by all means take a good look at it in person before buying so you don't end up disappointed.