It is a well know fact that the serial and/or body number on any pre '49 Ford is nothing more than a sequential production number.
The body number, which was only assigned to bodies that were out sourced by Ford, therefore it has no meaning for after production identification.
An example: My '36 Ford is a late production, Sept. 36 car, the serial number places it within the last few hundred built. It does not have a body number on the firewall, never did, therefore it is a Ford built body in lieu of being a Briggs. etc...