You haven't mentioned what carburetor you're working with. If it's got a pipe thread and an adapter fitting for the fuel line you can drill and tap the carb body for a reducer bushing and go to the next size larger pipe thread. The Quadrajet-type inlet fitting that also serves as a filter housing is available in an oversize-thread, self tapping version. I've never found a "thread restorer" compound that works well on fuel inlet fittings.
Jerry


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