I was surprised my local oreilys could get a pontiac one, they did have to order it but was here the next day, just wouldnt fit the W72 crank, as far as i know the crank is original. Maybe pontiac used the older year style cranks for w72's along with the 481988 XX blocks?
Mine is a lower power basic rebuild, just a mild cam, little higher compression with headers etc, my original had the hairline cracks in it too. i figured getting a better flywheel was worth a little more money, in case of any power increase like you said. The stock type in good shape should be good for some added power too.
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