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Hope it helpshonestly I would say it most likely is a carburetor issue believe it or not, if it dies when its shifted into high gear and the rpms drops but the motor performs when its is given a chance to catch up it sounds like the carb isn't tuned right for that trucks application. Could be carb tuning or it could be a vaccume leak. That's just my two cents hope it helps.
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Q: You have an 85 12 ton Chevy truck with 305 motor when it shifts to high gear it falls on its face let up on gas the rpms pick up and away you go put in new motor does same thing?
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