One-of-one 1967 Shelby G.T. 500 convertible. Photos courtesy Concours d’Elegance of Texas. When it comes to exclusivity, it’s hard to argue with one of one built, and most exhibition events are happy to display a single example of such a vehicle. Not so with this year’s Concours d’Elegance of Texas, which will display both a one-of-one Shelby Dragonsnake Cobra and a one-of-one 1967 Shelby G.T. 500 convertible. Once billed as “the most expensive G.T. 500 in Shelby American’s company car inventory,” this example was the only Shelby G.T. convertible to get dual four-barrel carburetors at the factory, the only convertible to get the 428-cu.in…
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