[JoeC]

also adding to the confusion is that there was also some 396 MKII engines that Smokey was working on

the 1963 427 Z11 was still used by some top Chevy drag racers in 1964 in the new 1964 Chevelle

there was the MKII mystery engine 1963 427 used in NASCAR Impalas and some Corvettes also built as 409 and 396 cu in

then when the production 396 came out in 1965 it was allowed to run as a 427 in NASCAR
as the early 396 block were made to take the 427 bore

another interesting mystery as mentioned in some articles and in Smokey's books was a 1964 Chevelle 427 test car