I don't know of any aftermarket supplier that provides billet main caps for Oldsmobiles. Eventhough your friend threw a rod he should still be able to replace the crank and damaged rods. He can also sleeve the damaged cylinders. It takes pretty heavy damage to make a block completely unusable. I can't imagine how your friend threw a rod on a stock engine though. Maybe over revving. Stock Olds big blocks don't like to turn more than 4000 rpms. 
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
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