Tarheel comes on here every now and again, so does Custom who bought him out.
The rebuild kit for the carb was/is a Carter 1571. As far as I know NAPA still carries it but I couldn't find that number on their site - sometimes they format the numbers differently.
The pump diaphragm, which is usually all that is wrong, is available at NAPA. It's an Echlin 2-4218 or Hygrade C203-5 (at O'Reilly).
Another good source or Henry J parts is Walck's 4 Wheel as many Henry J engine parts interchange with the Jeeps of the era.
http://walcks4wd.com/The four and six cylinder carbs look exactly the same but they don't interchange well as they are different internally. YF 833 should be stamped on it if it's for the six. The rebuild kits are the same though.