You may have a very early CC...According to the MARC/MAFCA Restoration Guidelines that back panel with the "Ford" script on top was from Start of production, October 1927, until February 1928. The next one, went from February 1928 to June 1928 without the "Ford" script.
Does your gas tank posess the following:
1. The flat type chock rod bracket or the long forged choke rod bracket?
2. Are there vertical reenforcement ribs on either side of the coil or no ribs?
Pluck