Looks like a nice car to me. 9 grand, for the numbers to match, well how much less is it worth because of the numbers. Even a clone car is worth something if it is done right.
I'm glad I bought my car a long time ago and my restoration is the first restoration. People got greedy with MOPARs, chevy guys started trying to flip them, and I'm sorry, Chevy guys shouldn't be allowed no where near a MOPAR. Yes, over the last twenty or so years a lot of shady things went on, but the Duster is nice regardless of the numbers issue. I think it isn't what the OP wants, a cobbled up clone car. If the car was misrepresented at sale he should be able to get a refund.