I was interested til I read it is missing the glove compartment door.
Because the glove box door probably had the mustang emblem on it instead of the GT 350 emblem.
Thats aside from the glove compartment, which is missing its door even though the dashboard is perfectly fine. Commenters on BarnFinds.com speculate that the owner may have had it signed by Carrol Shelby as many Shelby owners do with their cars and kept it for a souvenir.
Then again, as mentioned above...
Update: Following the publication of this article, the seller said it is possible that the car is a replica, which it has since been confirmed to be [by] Fox News Autos.
https://www.foxnews.com/auto/wrecked-rare-1966-shelby-gt350-junkyard