The 1971 Ford Mustang Boss 351 is rare ... There were also six exterior colors from which to choose, at no extra charge. All-in, you could expect to pay about $4,600 for a new Boss 351 in 1971.

The Ford Mustang debuted in April 1964 as a sporty, youthful car built on inexpensive mechanicals from the Ford Falcon compact car. The Mustang quickly proved a sales success and inspired a whole ...