440 wont start when hot.

Vapor lock x whatever.

A number of people with /6 have had this problem because the fuel line runs close to the water outlet and the exhaust of the #1 cylinder. The two solutions I have seen work are to re-route the fuel line for at least more stand-ff from the heat sources, the other is to put heat sinks on the fuel line. Use smooth metal clamps as I've seen some vehicles with clothes pins on them. lol