Assuming the date code, if any, is appropriate. The Shelby used the same radiator as the Mustang. Replicas of these metal code tags are available. The stamped in frame numbers are not.
Shelbys (San Jose Mustangs) didn't get radiators with the engineering numbers and date stamped on the frame - instead they were debossed in the top tank. Sometimes they also received a soldered on metal tag over the mounting strap. Hope this helps