I saw this car at the National Mustang Day show held this past April at the AACA Museum in Hershey. It was trailered into the parking lot of an adjoining hotel, unloaded and driven into the show. It is a fastback customized to look like a Shelby. The footage was shot at the nearby Tanger Outlets Mall in Hershey, about a mile away.
The wave idle is a common effect with large Rootes style superchargers, I heard it many times when working on the NHRA National Event crew in the 1970's.