Found the casting number for the engine which is 3764476 which makes it a 58-62 235. The other ID on the plate I found is F6I2J. The only "F" I'm seeing here http://www.americanclassic.com/paint.htm?p1=engines
is 8 cyl. What am I reading wrong?

The truck is a 59 3200 Fleetside.


1959 Apache 3200
In the Stovebolt Gallery