Yes, it IS an Imperial, a 1966.
"Originally the auto stylist Dean Jeffries was contracted to build the car for the show in late 1965, but when the studio wanted the car faster than he could deliver, the project was handed to Barris.[5] With the short notice, Barris thought the Futura might work well, and using Jeffries initial car, decided that its unusual winged shape would be an ideal starting point for the Batmobile." Source: http://en.wikipedia.org/wiki/Lincoln_Futura