[JoeC]

Yenko tried to get the 67 and 68 Yenko Camaros approved for NHRA Super Stock but was knocked down because they were not considered as factory built.
I believe he exaggerated his production figures on these two cars in his letters to NHRA. NHRA was pretty strict because if one of the auto mfgs (Chevy Ford Chrysler AMC) got something approved the others were very quick to investigate and protest the legality of the car. Bill Jenkins showed up with a ZL1 engine in late 68 in his 69 Camaro and was not allowed to run the car. He could not at that time prove that 50 ZL1s were built (they weren't yet)
With the Deuce, there should have not been a problem with Chevy giving the info to NHRA. There would have had to be a competitor that tried to run a LT1 Nova and went through the process with NHRA. The only reason I could think of why it may not have happened is because Chevy may have discouraged people from running the Nova and encouraged running the 70 Z28/LT1. Chevy liked to get the new models out on the track for marketing reasons. just a theory
I also wonder if the 69 Camaro 427 425hp was legal in the Stock class where they would need a 500 production min.