Plymouth built the Road Runner across three closely related seasons before its first major redesign, and the differences between 1968, 1969, and 1970 come down to details easy to miss at a glance – taillight placement, grille bars, even brake hardware. Nailing down the right year matters, too: a 1969 440 Six-Barrel car is one of Plymouth’s rarest factory muscle car packages, with only 615 ever built. Can you spot which year this one is?