I have a 4BBL stamped 90021 that does not appear on the list. I'm not very knowledgeable on carbs, but after quite a bit of fruitless research, it seems to be a modified 4160 electric choke vacuum advance. I suppose it could be a version of the 9002 600, but it has relatively unique fuel bowls that have fittings at the top for another line. After putting in every search term I could think of, and viewing hundreds of images, I only found one like it, but that link led nowhere.

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