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Looks worse than it is. A machine shop will hot tank it and then magnaflux it for cracks. The go from there. The cap missing is the rear main. Butler Performance Pontiac sells them, but any replacement will require that the mains be align honed to make sure the tolerances are at spec. Even if you find a cast iron replacement, you will still want to align hone the bores.

September 1968 makes it a 1969 model year. I suspect the block is drilled for 4-bolt mains? If so, you could add aftermarket 4-bolt main caps and have the bores align honed.
 
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