a 1969,70, and 71 Super Car Clinic I just learned of, John Petrie and his dream set of hemi Mopars focused on Canadian Mopar dealerships, a Bee, GTX, Barracudas, Challengers, Duster and Demon

In the U.S. the clinics were being conducted by well known drag racers, but because American press is so damn MYOPIC, they didn't see what else was going on around the continent unless someone named Don was going to be racing there.

The U.S. Plymouth division had SOX and Martin of North Carolina.
Don Grotheer of Oklahoma represented the Plymouth line of performance cars.
The U.S. Dodge division had Dick Landy from California.
Bill Tanner of Georgia to represent the Dodge line of performance cars.

The success of these performance clinics were remarkable for their time.

http://johnpetrieracing.com/?page_id=846

In 1970, he ran a full racing schedule and made 66 clinics.

The Duster was converted to look like a Demon for the 1971 year, and a 71 Barracuda was over acid dipped by accident