That thing has low body miles but, the work looks meh IMO. Definately not something i'd buy long distance. Probably an ex track car for sure, be careful!
Turbo kit looks interesting, and that intake looks like a custom piece. I too agree that 4.30's in that car are odd. Unless you are willing to gamble with 20k, I would pass. That car could end up costing you 27,500 by time you are done rebuilding if it has issues.
There are a lot more nicer cars out there for near the same money. If it hasn't sold by now for 20k, then safe to say something must be keeping buyers away.