47-55.1 Does this look familiar to anyone?

[TX3100Guy]

Along the lines of the fuel system and me wanting to drain and overhaul everything from the tank to the carb, today I removed the mechanical fuel pump. There is/was an electric fuel pump that is frame mounted after the tank petcock and before this mechanical pump. See photos below. I'd like to disassemble this one to rebuild it and/or just replace it. However, given the unique nature of this 1953 truck with a 1959 261 engine with a supercharger, I'm unsure just which mechanical pump this is, let alone how to open it up for rebuilding. Assistance will be greatly appreciated.