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This drawing is also shown on page 93 of the Judging Guide.
You guys do realize that Chevrolet P&A books of various years of that era reflect the sleeve part # is different than that sketch. Various parts books show the sleeve part # as 3866271.
I always thought that there were two different length sleeves used in this application but can't find anything to back that up.
I would have no interest in this issue except I remember standing across the parts counter in 1963 at the dealership parts manager talking about the same issue. We didn't resolve it then (or did we?) and apparently, it's still a mystery.
I'm thinking the longer sleeve went away when the shorter one was released.