Hey Bill, I have seen them registered as Shelby Cobra but when I went to do that Shelby is not listed as a manufacturer. Mine is registered as a 1966 Ford Roadster as that was the closest manufacturer and model we could find. New Hampshire is one of the sensible states that registers the car as the model it most closely resembles I believe. The old date codes on engines can also help with that. You will probably need to do a VIN verification.
http://www.nh.gov/safety/divisions/d...ts/tdmv19a.pdf
Let me know if you need help with that.