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Did you install a new 439071 carb kit or are you using the old parts in it?
It seems the carb is getting too much fuel so I would suspect the float valve might be leaking, especially if the float height is set correctly. If the brass seat was removed, there is a thin sealing washer which must go back in again and the seat must be tight, not snug, to prevent any leaking past the sealing washer. The tip of the needle may be worn or damaged to, along with the surface in the seat it rides on. Any dirt or fibers in the seat area will also cause fuel to leak past. How’s the float? It may be soaked with fuel and be too heavy to close the valve at the desired time.
Can you post some photos of the inside of the carb and bowl?