1967 Shelby 350 & 500 G.T. original vintage advertisement. Do you trust your wife? You can - when she's driving a Shelby GT 350 or GT 500! Performance cars? Emphatically - but in the Carroll Shelby tradition of safe performance. The GT 350 features the Cobra V-8 Shelby-ized to produce 306 hp. The GT 500 is a street version of the 1966 LeMans winner's 428 cubic inch engine. Powered by Ford.