All of the manufacturers were involved. Jim Wangers at Pontiac always had a fleet of GTO's and Grand Prix's that were being tuned at Ace Wilson's Royal Pontiac in Royal Oak. This was the famous ad from 1968 that cause an uproar and causing GM to pull the ad...
You can buy a copy of this ad at Classic Auto Images. I'm ordering this as the 24" X 36" poster.
Even AMC ran a few cars out of their engineering department including American's, AMX's, Rebel's and Hornet's. Olds ran 4-4-2's out of Lansing and Ford guys had Boss and Cleveland powered Mustangs and Cougars. I was born too late. I wish I had been born 10 or 15 years earlier.
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