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In the late '60s, Ford had several successful performance editions of the Mustang. But even so, Shelby developed a few of his own prototypes to further explore the limits of the platform. Ford named it the Quarter Horse, building the pre-production prototypes in 1969 with lots of interesting design cues they linked to the Shelby and Boss Mustangs.
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Those cars had a Shelby front end with a Mustang rear end. Ford added a Boss 429 engine and a Mercury Cougar dashboard. Their idea was to produce a more affordable Shelby GT 500. However, Ford killed the project in 1970.
