Also bear in mind the OEM cooling systems with a big fan running all the time blows air right over the fuel line. Back in the day when these cars were made a lot of the materials they used weren't up to today's standards and would degrade quickly with high under hood temps. The big OEM fans weren't just to cool the water passing through the radiator, they also helped keep under hood temps to a tolerable level. The OEM systems provided quite bit of air flow down around the fuel pump, and the metal line going to the carb.
Most likely not your problem ... but something to think about.
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