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You could go with a Robert Pond iron (they also have aluminum) 427 side oiler block.
After a long and extensive search for an original 427 side oiler block, I settled for an original cast iron 427 center oiler that my engine builder found for me, only to find a crack between the cylinders of the sleeved (which I really didn't want a sleeved) block.
The Pond block was recommended by my engine builder so I went with that.
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