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Yes, use the vacuum advance port. It's called out in the FSM vac diagrams.toyman317 said:Here is a question regarding the vacuum source for the DUI. Supposedly the DUI requires vacuum from a port on the side of the carb. Right now that is not a problem with the Holley that came with my 60. However I would like to go back to the stock carb and I don't see a vacuum port on the side of the carb. There are many other ports lower down at the base of the carb but not higher up like the Holley. Will the DUI work with my 84 Aisen carb with regard to the vacuum requirements?