Around here it's time to break out the champagne if the sonic report on a block comes back with .203" as the thinnest wall.
Worse block was a '66 GTO block that was running. It measured .030" over on tear down and we had it checked before ordering a stroker kit. Without being touched it had one wall come in at .034" and the one next to it at .036". Plans changed and it became the guy's base for a coffee table.