Driving Line has an article about the history of the G-Body “Aerocoupes”… namely the Monte Carlo SS Aerocoupe, and the Grand Prix 2+2.
There was a second era of aero warfare, however, that’s rarely seen the same intense spotlight shone on it. The first shots in this particular engagement were fired roughly a decade later, in the early ’80s, when one automaker sought to challenge the box-like shape of existing NASCAR silhouettes in the pursuit of startling top speeds. It was warning shot that jolted a sleeping giant into an unusual response on both the track and the street.
It’s a pretty interesting read. Check it out here: https://www.drivingline.com/articles/classic-nascar-tech-on-the-streets-the-curious-case-of-the-gm-aerocoupes/