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Everything you describe sounds incorrect for a late-31 with an indented firewall (it might just be my misunderstanding of your description).
There is a shutoff valve up on the firewall. Then a steel line (no filter or sediment bowl yet) down to the carb. A small sediment bowl/filter is bolted to the side of the carb and the steel fuel line goes into it. The sediment bowl (all cast iron) has a little drain valve on the bottom of it, to drain water and dirt out.
There is a good picture of the fuel system in the original owner's manual (Ford called it the Instruction Book) in Fig. 11 and the carb in Fig. 12, in the attached PDF file here.
