Bob,
The affectionately named "turd" Cobra was the 427 'lightweight' car that raced one time in Nassau against the Corvette Grand Sports and the like. It simply walked away from the field until breaking down. The car is also known as the 'fliptop' because of a one piece hood and bonnet that looks very similar to the Coupes on the front end. You are correct, it too wore the FIA styled opening on the nose. If you look closely at pictures, however, the body is very, very different from the other S/C cars.

Details are at the link below...
http://www.csxinfo.net/compcars/fliptop/fliptop.htm

Brian Carlson

Unique 9122 - 289 FIA Cobra - The Legendary "Spence" Car