I bought mine for 6K. It ran fairly well and got a sticker after a few temp floor pan fixes. Since all these shows like Barrett Jackson and Mecum have been on, everyone thinks they have a gold mine and over price. I think that's a fair price.
After tearing mine down there was all kinds of problems I didn't know existed. All the aprons are shot under the fenders, cowl is gone which I expected. I am in the process of rebuilding everything slowly. Little knowledge lots of support.
I second guessed paying what I did but I figure I have the car so I am grateful for finding something in my price range. I looked at worse Stangs for more$.