Hey y'all,
In case you didn't know, in the Supercar era of the late '60's, up here in Canada, there was a deal much the same as the Sox and Martin/Dick Landy clinics of yore.
Petrie was different in the fact that he represented both Plymouth and Dodge! AND: He drove E bodies!!!!
There is one well known picture of this effort that can easily be Googled (pictured).
I'm wondering if anybody else has pictures of these events? I haven't seen anything else anywhere....although lots of people attended these clinics!