Does that center carb have the fuel line on the same side as the other two? (It doesn’t look like to me) If so, that’s not an OEM Chrysler 6 pack carb then. I believe it to be the DC center carb.
They're all on the same side, I just took the fitting out to show the threads. The only numbers I could find on the center carb are on each side of the body, and the top corner of the air horn.