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You should be able to find a rebuilt carb for that. It sounds like the needle and seat are shot and allowing it to flood out. Check with your local parts house and if you don't have any luck, get back to me and I can do some checking. Your VIN number would be helpful here. All follow ups are included in our fee.
Look for a tag on the top or side of the carb and see if we can match it up. Let me know if it is a 2 bbl or 4 bbl carb.
I checked with my parts source and they assure me those carbs are still available in rebuilt versions. Get back to me with some numbers or a photo of your carb and the VIN number and I can get you the part number.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?