Tim,
I'm jumping in to correct something you posted earlier in this thread,
You said, "0365139 = serial number = 365139-1000 = 364139th vehicle off the assembly line that year".
The engine serial number was not used to identify when a vehicle came off the assembly line, the chassis serial number does that. The engine serial number was stamped on in the engine assembly shop long before it got to the final body/chassis assenbly line. So the engine in question is the 364139th out of the engine shop for the 1956 model year.
Mike B
