almost impossible to tune these without a vacuum gauge. I have managed to get them to idle very well once set up right with the proper setup. if they sat with bad fuel in them for two years then they will need to a good long soak in some carb cleaner, then a thorough rinse and dry. linkage will need to be adjusted and properly set.
as far as carbs needing to be broken in whoever told you that needs to lay off the crack pipe...
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