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Just looking up old posts. If you are still around, that engine was a mildly built one. I have the same pistons and rods in my 455 they are common build up parts for a mild street/boat engine. I doubt the block is a "Mondello" block because those numbers you read are standard Oldsmobile casting numbers for block.
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Dan
'77 Cutlass Supreme
'46 2 door
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