Dave Koffel became a Mopar factory guy in the '60s and still is active, as far as I can tell, within the Mopar community. This is one of his websites:
http://www.b1heads.com/
But, his "Flintstone Flyer" SBC-powered Packard, and later, Studebaker Lark Gas Coupes were originally the cars responsible for his notoriety. The Mopars came later.