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Hi and thank you for your question.
Did you inspect the fuel pump side of the carbs when you did the rebuild?
Did you double check the vacuum line to ensure it is connected to the intake?
Do you feel engine vacuum pressure on that line?
As best as you can, please describe where on the carb you are feeling, or if on the line, let me know where you are trying to feel vacuum.
Jut following up on this. Have you made any headway or if not, checked into the questions I posed for you?
Let me know how I can help.