The golden age of the American muscle car spanned from the mid-1960s to the early 1970s. During that time, one of the most iconic muscle cars of the 20th century debuted: the Plymouth Road Runner.

Though Plymouth originally marketed the Road Runner as an affordable muscle car, fitting a 426 Hemi V8 made it anything but cheap. At a $714 option, the Hemi raised the price considerably, yet ...