If its as clean in real life as it looks in the pictures, i wouldn't be surprised to see someone ASK 16-19 for that.
its a v8 car
its NOT a 73+
its clean
it doesn't need painted.
this is a nice counter example for someone picking up a clean-ish slant six car for 5K...that needs a little body work...and then having 20+K in it after swapping the driveline and painting it.
I'd say anything under 17, you make a fair deal. 15...you made a really good deal under 13...you're stealing it.
You and I in the rust belt know what it takes to find something like that around here.