Introducing a true gem-a 1971 Ford Mustang Boss 351 in rare survivor-grade condition. This one-owner marvel was originally sold at Kayser Motors in Madison, Wisconsin and is a standout among its peers, with only 1,806 believed to have been produced. Powered by its original, numbers-matching 351ci V8 engine, cranking out an impressive 330 horsepower, paired with a 4-speed manual transmission, it's a thrill on the road. Finished in its original, untouched Bright Red paint over a pristine Red…