Check out this link, nearly an identical car. A car like this, still in the original owners hands and unrestored is worth an amazing amount of money. So many of these cars have been altered, abused and cut up that finding an unmolested example is thrilling.
Anyone that has read the Registry can tell you that so many Cobras have questions about their past. I feel the value of this car is well above that of a "regular" Cobra in street trim.
I chase original '67 big block Corvettes all over the country and to find one the equivalent of this car would add quite a bit to the value.
http://www.pacificsites.com/~brooke/CSX3282.shtml