The 1970 Plymouth Superbird is the other wing car, and in some ways more interesting than the Daytona because Plymouth's existing lineup made the engineering choices more constrained.

The Superbird used the 440 and the 426 Hemi, same as the regular Road Runner. The aerodynamic modifications — the nosecone, the flush rear window plug, the wing — were adapted from the Dodge program. Plymouth built 1,935 of them, enough to satisfy the homologation rules with room left over.

The extra production volume has made the Superbird slightly more accessible than the Daytona. Slightly. Both are genuine collector cars that will never be affordable for most enthusiasts. But they represent an era of factory-built race cars for the street that will not come again.