[niky]

Originally Posted by freebeard

https://www.automobile-catalog.com/c...20_c-type.html

The wing might put it to 0.70 or so, but without it the underbody and radiator ducting would put the Cd lower than stock. So, who knows....

Looks like some good time attack or hill climb experience went into doing that body work.

Like how they sealed the sides to give the diffuser proper airflow.

Still probably not very aerodynamic.