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Pick up a 140 amp alt from a mid 90's caprice or Caddy from the wreckers (140 amp is standard on these cars...also get the alt bracket as it is bigger than your stock one.
Any local alt. rebuild shop can rewind it for 180 or 200 amp.
For what kind of vehicle? I have a 200amp Ohio Generator sitting at my shop that is new in box that I am never going to use. It is a Ford case but a little creativity might make it work for you.