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Thanks all. I think I know how to proceed from here. And yes, the problem was overtightening the valve seat. It doesn't take much to strip the threads - a note of caution to anyone trying to make adjustments.

One of the needle valves on my 68 GT500 is stripped and won't hold in place. Anyone know where to find an insert or have repair recommendations? I was thinking Holley had a repair kit at one time but can't seem to find one. The carburetor is original and I really don't want to have to replace the bowl. Any suggestions appreciated.