Just thought of another suspect.
Modern fuel attacks the "rubber" tips on the old fuel needles. This can cause the tip to deteriorate.
When it gets warm (from carb heat soak after stopping) the tip gets soft and can either cause bad seating and flooding as described above or it can stick in its seat giving the impression of vapour lock.
I know many jeeps have suffered from these problems. Cure is to get a replacement all-metal needle and seat from any tune-up shop.
Lang
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