The 557 blocks absolutely are thinner and weaker than earlier castings.
But, as said, they're fine for mild builds. Just be sure to magnaflux it and look for cracks at the dowel pins in the main webs.
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'72 Formula 400 Lucerne Blue, Blue Deluxe interior - My first car!
'73 Firebird 350/4-speed Black on Black, mix & match.
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