The earliest Mustangs featured the 260 V-8. Although a carry-over from the Fairlane and the Falcon, this little engine has a devoted following. I've own one for many years and it is a scrappy little performer! I love it when people tell me that the Mustang started with a 289! Carrol Shelby used these engines as did the Roots Group (UK) in the Sunbeam Tiger.