Running a vented cap on a '65 will let gas leak out on acceleration if you have more than 1/4 tank of fuel. I would use the later sender with the 1/4 outlet. That said, boiling in the carbs after shut down won't be cured by this. Modern fuels boil at 140 degrees and are not formulated for carbureted cars. Nature of the beast these days.
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Jeff 
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