Car looks very nice. My honest opinion is that you will pay whatever he's willing to let it go for. But my TOP DOLLAR offer for that car, without checking anything else out, is about $7-7500 range. I'm assuming everything works, and everything is there. Gotta find out if 9500 is his firm price or just a starting point. I'd fan out 70 one-hundred dollar bills in front of him and see where he goes with that.
There is something wrong with the spoiler too. Took me a minute to figure it out, but if you look closely, each of the spoiler tips are on the wrong side. The spoiler tips are directional due to the slight swooping shape of the spoiler. It isn't exactly straight across. Whoever glued the ends in, got them on "backwards". Angle of the tips don't match the trunklid lines and it's overall a bit shorter than an original wing. An original wing comes almost to the outer edge of the quarter panel tops. Go ahead, go back and look. You'll see it. Personally speaking, I'd have never put the spoiler on a vinyl top car, but that's just me. It wouldn't be a deal breaker for me, though. Just take the spoiler off and fix the ends. Repaint and go.
Here's a gennie
H/O spoiler for comparison.