T he Shelby Mustang needs little introduction. Built by Shelby American from 1965, the high-output Ford Mustangs quickly earned their reputation as race-bred performance heroes.. The 289ci GT350 was joined by the GT500 in 1967, powered by a 428-cube FE V8 topped with two Holley four-barrel carbs.
https://www.whichcar.com.au/news/1967-shelby-gt500-discovered-in-garage

