My December 1966 built '67 has no AC but does have the HD cooling system and vapor return line from the large fuel filter mounted at the T-stat housing in a bracket. And it keeps the fuel nice and cool. I ran without it for a number of years and had vapor lock issues. Not anymore! There are pictures of this on older threads about this topic....I'd post a fresh picture, but can no longer post pictures on this forum.
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Jeff 
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