[kurtmart]

I think the bigger point here is that the Chassis plate on this car, most likely, has nothing to do with the car it's attached to. Those plates can be bought online and stamped with anything you want.

No Shelby product has a "CVX" prefix in it's chassis number.

If you want to find out the make of Cobra you're looking at, post some pics of the entire car, including hood hinges and suspension shots.
The folks on this site will ID it in about 5 minutes