I've seen project cars in this condition sell for around 8-10k
This is a running RT 4sp car, albeit the drive train needs a rebuild.
Hate to see it taken up for parts. These cars are getting harder to find, and I've seen worse get rebuilt.
The frame is solid and it is matching numbers
My opinion, if you can get under 10,000 buy it. I would!
If you have some skills, you can decrease labor costs by doing some of the work yourself, or do it a little at a time.
Rebuild costs almost always exceed the value. This is after all a hobby!
If you like the car, go for it.
70convert