The Shelby was a specially-built Mustang farmed out by Ford and backed by the factory, hence they got all the billing and promotion. In those days GM was "officially" not into factory-backed racing. Insurance premiums were awful and there was a GM limit on cubic inches in the F-body cars, so no Camaros got factory-promoted 427s like the Mustang got 428s in '68 and '69. Many dealerships like Fred Gibb, Don Yenko, and Bill Thomas transplanted 427s into Camaros in '67 and '68, but it was a "back-door" thing, not nationally promoted. Even the 427 COPO cars of '69 got no national promotion. The Donohue Z/28 Lake mentioned is still a legend--it dominated the Trans-Am circuit in '68 against factory-backed Mustangs and put the Camaro on the map to stay. I have a healthy respect and admiration for the Shelbys also, but the Camaro did it the hard way--it kicked ass against all odds. Many a Yenko 427 car made a factory 428 Super Cobra Jet '69 Mustang with the Drag Pack eat dirt. The ZL-1 just ran away from them. Chevy may have not advertised their supercars, but they managed to build factory hot rods that put everything else on the trailer! I wish the new Camaro would do the same.