Sure sounds like an air leak and there comes a time when a new carb is in order as well ... and now may very well be the time. Your engine hasn't been run much so I'd like to suggest a few easy checks before you order a carb just in case you need something else.
Compression test...did you do one with a gauge? Need to ensure your valves are not stuck. Also, check all plugs, not just the wire spark, and centrifugal advance springs (under distributor cap plate) for rust...lubricate those.
__________________
Mo
"Odyssey"
1976 C&C 30 MKI
The pessimist complains about the wind.
The optimist expects it to change.
The realist adjusts the sails.
...Sir William Arthur Ward.
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