Rolling chasis from the factoyr

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I was talking to a friend who raced a 1970 Camaro. I remembered while talking to him there used to be a unusual story about that car. He explained it was bought brand new as a rolling chasis no engine no trans in primer and came with no title or vin it was picked up at the factory. He said theese cars were only sold to some choosen racers they were called white on frame cars. Anybody ever hear of something like this.