Maybe this tank for a later Chevy P/U with bed fill option would work? Options for in-tank fuel pump, or an alternate pickup for carbureted engines. Or, Summit carries the Tanks, Inc universal fuel cells for just over $200. Tanks, Inc stuff is good, and doesn't usually break the bank. Shop around, and you should be able to find well below list price (Summit may be among the lowest).

Doug

1947 2nd-Series GMC FC152 3/4-ton
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1953 Chevy Bel Air Sport Coupe Powerglide