Gen 2 barracudas had 3 flavors, convertible, fastback and coupe (notchback). Many have said the notchback looks like a roadrunner that got left out in the rain and shrunk! I really like the lines on the notch..
I had a guy mistake my old 67 notch back for a corvair so I am not sure about looking like a road runner. People don't really pay attention to details.
I would say a 69 dart looks more like a mini road runner