A crack in that location is a prime candidate for JB weld, or some other form of metal epoxy. Do the little drill holes on the end of the cracks as Jason described, or it will just keep spreading.
If someone is going to weld it, make sure they know what they are doing and have done them before. I have seen guys weld a small crack just to have it crack all around the weld, Then they go to weld those cracks, and a bigger set shows up. By the time they finish chasing their tails, the block is scrapped. I believe the secret, if welding cast, is to preheat the area up to around 400°.
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