I would just clean it up real good and use an epoxy to reseal it. Wire brush on an angle grinder then lacquor thinner. The trouble with any kind of welding, brazing or even pinning is that it will always show up and devalue the whole tractor. Just epoxy it again untill it comes time to rebuild it and then get a good block. The money you spend on a block will be a lot less $ than any repair you can do to it (other than epoxy) and you wont take a hit if/when it comes time to sell the tractor.
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