My solution to the problem would be to replace the carb and be done with the issue. Do as you see fit, it's your engine. Just a FYI you said you have an opposed Vanguard, if it is a horizontally opposed twin it is not a Vanguard, Vanguard twins are V-twins.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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