If you haven't already done so...
...before you get too far putting those carbs back together, make sure the body of the carb is
absolutely flat. Over many years of people overtightening the bowls, the carb pulls out of shape. This leads to finicky operation and inability to tune the carb due to leaks. If not flat, take a large flat file and file the body flat.
Edit: I found a picture of one I did a while back. You can see the dark spots are the low areas. You can see how it was high around the screws.
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