11. 1969 Ford Mustang Boss 429
The 1969 Ford Mustang Boss 429 stands apart in Mustang history for its purpose-built design. Ford created it to homologate their massive, Hemi-headed 429 V8 for NASCAR, which required extensive modifications to the Mustang’s engine bay just to fit the beastly powerplant. This engineering feat pushed the Mustang far beyond its usual performance limits, resulting in a rare and highly coveted collector’s car. Explore the Boss 429’s unique story at Hemmings.