The Stovebolt Site Forums The Shop Area Interiors early or late 49 chevy P/U

http://chevy.oldcarmanualproject.com/chevyresto/4952.htm

GBA325874 engine serial number stamped into the block
GBA = 1949


385253 block casting code
any chance you dropped a digit and it is 3835253 (1949 216 truck block)

http://1954advance-design.com/Stovebolt-engine/casting-numbers.html


Here are locations of head and block date casting-codes.

None of the above information will definitively tell you if you have an early 1949 cab or a late 1949 cab.

Have you looked for any of the distinguishing characteristics at the links in my earlier post?