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My best guess would electrical, aka alternator output too low, or some such. When you added the HEI, did you run a new wire to it? The old one is 6 volt, the HEI needs 12. The truck can run on 6 volts, but the HEI is at its lower threshold at 6, and any sort of drop could push it over the edge. Revving the engine brings the volts back up, clearing the problem. If the truck comes to a stop, the alternator output drops a little, and if you are weak on juice, it could cause what you describe. If you have a voltmeter, it would be super handy to monitor it too see what is happening. Unfortunately, most of the trucks only have an ammeter, but a volt meter is what ought to be used.
This is my best guess only.
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jku Cornville, Maine
68 C10 burb
42 Willys MB
46 Dodge WF-32 1.5 ton
53 & 56 Olds'
60 Cadillac
22 Dodge Brothers
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