5/8-20 is kind of a special thread so I would wonder how readily available a repair kit would be. Also, is there enough meat on the carb body to drill and tap oversize for the insert? Is there any kind of specialized repair pieces at a carb shop who routinely deal with this kind of situation?
Is there a chance you could get a 5/8-20 tap and rethread your existing. There are several places where you can get those taps although for a one time use, at $16.50 this is one of the least expensive. McMaster sells the same size for close to $50 although it is probably a better brand.
http://www.victornet.com/subdepartments/Special-Pitch-Taps-9/16-to-1-1/8-inch/1270.html If you went with Victor they do have a minimum $25 order so you would need to buy something else to bring the total up.
If you can rethread and if the plug is slightly loose afterwards and doesn't seal even with a new fiber washer, Amazon and other places sell a teflon paste pipe sealant which is gasoline resistant and could be applied sparingly to the plug..
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