While the Boss 429 is immensely popular among collectors today, this was far from the case in 1969. Many Mustang purists had hoped for the 429 to be a car that reigned supreme over all other muscle cars of the day. However, Ford never intended this of the Boss 429 rather envisioning the car as a testbed for their newly designed NASCAR engine. However, this was a point that never fully resonated with the Mustang’s fanbase, as only 857 Boss 429s were sold in 1969.
Even though the Boss 429 would only remain in production for two years, its legacy today remains. The iconic Mustang would feature one of the largest big-block engines ever utilized by Ford in a production vehicle. This engine would later find success within NASCAR competition when placed in the Ford Torino.