Kelly,
Shelby bought 3 GT5-S Panteras directly from the factory (sans drivetrains) and put Chrysler engines with turbos in them as prototypes for possible importation. Those were the only ones he did, and as far as I know are not official Shelby vehicles, just ones he had his hand in. There is documentation that links these specific cars to Shelby (and it may come with the cars).
Michael
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