[Jeff H]

I think that memo is really just trying to explain why some of the late run 69 models had the 3 digit engine code beginning with 'C'. Those all look to be 69 model year engines codes and the new 1970 model got a different batch of codes. It's a great memo explaining what happened but doesn't really do anything to help prove/disprove the L78/TH400 option combination. Did they make any 1970 Novas with the L78/TH400 that are known to exist? If there are 1970 Chevelle L78/TH400 cars I would think it was available on the Camaro and Nova as well. They all shared the same engine codes.