Bobby D. thanks for posting that "war and peace" of engine data, what is the source?
According to widely recognized
MOR TEC
and several other tech sites that quote GM production
the 3914678 cast was used for 327 as a two bolt and a 302 as a four bolt. As was the 3955618 327/2bolt 350/4bolt.
add to that John Z being there.........
Trust me, I would love to see proof of a factory 4bolt 327 in a passenger car from detroit.