After a break of 17 years, the Ford Mustang Mach 1 is roaring back onto the muscle-car scene with a 480-horsepower, 5.0-liter V-8 under its hood, plus plenty of parts taken from the mighty Shelby GT350 and GT500 — carrying a just-announced price rolling up on $53,000 when it arrives at dealerships in the spring. Time has been kind to the Mach 1 because when it was last offered for the 2004 model year, it was powered by a 305-hp, 4.6-liter V-8. With exactly 175 more ponies than its predecessor, the 2021 Mustang Mach 1 is aimed directly at rivals like the Chevrolet Camaro SS and Dodge Challenger R/T.