The same exact thing happens to me with my 440 68' Charger. Only happens after about 1 hour of constant driving. I have a vent hose from my gas cap that I blew out with my air compressor - thought that may have done it, but then it actually happened last night after an hour drive, totally annoying. I also have a spacer under the carb. - I've made sure all fuel lines are clear from any substancial heat sources i.e. headers, exhaust. I have also replaced the fuel tank and sending unit. I may try heat wrapping the fuel lines as I don't what else to do.
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