Not too bad considering what others are asking for E-bodys way worse than this one. I'm not a fender & paint guy so this would be a better starting point in my mind. Of course you'd need to get some eyes on it before making any kind of decision.

https://greatfalls.craigslist.org/cto/d/great-falls-74-challenger-project-440/7642567285.html

Orange paint on the outside, yellow engine bay, green interior. Price is not far off, but still needs $$$ to be right.

Wonder what the underside looks like and what is the black stuff they slathered over the floorboards?

That black stuff is likely POR-15, or Rust-Mort, or some other product that stops/converts rust...or hides it...

With all the money spent on new metal, why would you short cut proper floor repair - or at least do a better job of it? I'll bet the panel gaps are out of whack too.