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One more heat susceptible thing, not related to fuel, was the TFI
(Thick Film Ignition). Ford used it in the 80's and early 90's. I'm not sure if it was used on the 460 engines but it's highly probable.
The short story is I ran into this with a 1990 5.0 engine that worked fine previously, then sat around before it was installed in a hot-rod. The engine consistently ran poorly when hot and was even hard to start.
Usually the fix was to remove the module from it's mounting on the distributor and put new thermal paste between the module and a heat sink on the main distributor body itself. Apparently the thermal paste dried out from either time or inactive use.
Wes
