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Re: Needing advice on vapor lock problem.
Sounds like you are making progress.
In my experience, a standard duty thermal fan clutch is what you want. The heavy duty ones engage at a lower temperature and can sound a bit like a jet engine at slow speeds. I went with a standard thermal clutch and don't have any overheat or vapor lock problems even in summer heat while running the AC. Have ceramic coated headers.
5 blade or 7 blade fan?
Might put some fuel line wrap at your 'pinch point' by the header collectors. If the return line is there as well, might wrap it just in case the fuel in it is boiling and limiting your return flow.
Carb spacer or a thick thermal carb gasket?
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