That isn't the trans code, as that is a servo cover. Post a pic of the complete trans or as mentioned look at the shape of the pan and you will get a better answer.
Pulled the tranny out of my 65 Flareside(stepside is a Chevrolet) and i was told it was a C-6 but would like to know 100% casting code C6AP-7D027-C anyone have a clue