For some reason some call this a King Cobra, not Shelby. This was a 427 car modified by its owner with Dragon Snake parts. Supposedly there was only one factory 427 Dragon Snake, CSX 3198. And yes Shelby built a King Cobra which is shown in Huggies post. Of course we're talking about Shelby, so anything is possible
Martyn Schorr wrote a great book on Motion Performance, "Motion Performance: Tales of a Muscle Car Builder." One of the early performance shops to have a chassis dyno. The book has some good background on the Cobra and Clem Hoppe, its first owner who mysteriously vanished without a trace.