G/7, Jon,
I got that date from the " the chevroletcamaro.com" site years ago, it has been updated but still cites the Dana 427 camaro being built 6 months before the first GM 67 396 camaro. Very early, With all the main players being close to GM's R&D department I still wonder if that car was/is a Prototype. It seems that there are prototypes missing and no BB prototypes accounted for. Hmmm.
Victor