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Welding is the proper repair, and can possibly be done with the engine in the car with the proper prep of the vehicle electronics. That being said, I once repaired a cracked Mercruiser 140 inboard. It is a 4 cylinder (half of a Ford 460 c.i.) with aluminum block that was cracked between a couple of the cylinders. I veed out the crack and JB welded it. I was doing this for the owner who didn't follow advice on how to nurse a leaking heat exhanger. Anyhow, I used the JB and it held to my surprise. I thought the aluminum expansion would crack it again the first time it got to operating temp. The damage you have is probably not a highly stressed area, it's a support area. Put the big bucks into the IMS bearing.
Best of luck to ya'.
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1986, '87,'88 928S4, 2006 Cayman S Cabluey, 2006 Cayman S "Burn Notice"
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