First guess like you said, would be a vacuum leak.
I would just remove the 1" spacer for a short period of time and use a good gasket between the carb and intake and see if it goes away.
All of the extra nipples on the carb plugged?
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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