[MOTORHEAD]

I don't see how the vin tag can be worth much without title/registration. Anyone can buy a blank Shelby/AC vin tag and stamp any number they want on it. If the car is a true original with a CSX vin, that number would eventually become known to the Shelby Cobra community, and I suspect a lawsuit would follow, initiated by the last owner, their estate, or insurance carrier, if it was insured. I think a safer path to follow would be to research the vin to determine its legal status and try for a finders fee or salvage rights to whatever you can bring up.