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Yep it can be rebuilt but not always properly!
I would say as already mentioned it is a float height issue or a stuck needle and seat dont take much to stick them open just a tiny bit of crud will do it! doubt the block would do much if it is flooding.
dont do the weber! they arent real flash in 4wd's, have a few mates down here who have put them on race cars and they dont like angles alot at all! they also 'breathe' through the main shaft which sucks a tiny bit of mud in and jams the throttle open....only reportin whats happened to others.
Steve.
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I know this is late,but if you are still having trouble I would check the fuel pump pressure and the return line to the tank.
Pearcey.