The upcoming Barrett-Jackson Scottsdale auction will feature a number of rare and historic automobiles, not least of which is this 1966 Shelby GT350 Ford Mustang prototype. According to Barrett-Jackson, it's the very first prototype for the '66 Shelby built and has been documented as such by the Shelby American Automobile Club. It also boasts its numbers-matching 289 cu. in. V8 and 4-speed manual transmission
