I didn"t remember that Ford still made 429"s in 1982. Does it use a mechanical, on the engine fuel pump? I have an 84 F250 with a factory carburated 460. It has an electric fuel pump for each of the two gas tanks and a setup that changes fuel flow from one tank to the other. It also has a device in the fuel line near the carb that cycles some of the fuel flow back to the tank via a return line. I assume that the device was put there to avoid vapor lock, as it is in the highest point in the fuel line. I have never had any vapor lock problems with that truck. I don"t know how such a device would work with a mechanical pump, but it sure seems to work well with the high flow electric pumps.
Something we used to do while waiting in the long Summer lines to get a turn to drag race was to open the hood to vent the underhood heat a little better. We also hand pushed our cars in the lines, but that wouldn"t be nearly as easy with a loaded grain truck!
Opening the hood would cost nothing, and it might help. Just don"t forget to close it. Rigging an electric pusher pump, a vapor separation device and a return line would probably eliminate the problem, but it might end up costing several hundred dollars.
I doubt that using premium gas will help a vapor lock problem, but trying some wouldn"t hurt. I know of no additive to prevent vapor lock. I remember guys wrapping their fuel lines with many layers of aluminum foil as a kind of heat shield, but I don"t know if it actually worked.
Vapor lock is a hassle that I don"t think most people have to worry about anymore with fuel injected vehicles. But I sure remember those hassles, and I think modern gasoline makes it even worse. Good luck!
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