Many say the best Road Runners were built before the smog police went nuts in 1972. But we're still digging this '73 400 big-block in Petty Blue (aka Basin Street Blue). With 17,443 built, '73 Road Runner sales nearly tripled the 6,159 sold in 1972. All coupe and convertible body styles were eliminated when the Plymouth B-Body was totally redesigned for 1971. Thus, all Road Runners are hardtops from 1971 onward.