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Well, you sidestepped my questions, but that's OK. Not to belabour this and hopefully to address the original concerns of the OP, but I think now we can see how and why shops routinely deck blocks.
It's unfortunate that so many people place great financial importance on having the original block with untouched stamp pad in a car, but that's the way the car hobby has gone. It's unfortunate also that engine overhaul shops knowingly or unknowingly destroy this perceived value of the car by performing a machining act in the name of 'quality'.
Most likely the engine in the car you were/are looking at was decked for the above reasons. If the seller was unaware of the ramifications, too late now. He's not the first and not the last. Good luck in your search.
Once again we can machine the decks with out cutting the numbers on the stamp pad as have done alot of them over the years and most old block are rusted so bad on the decks they need to be addressed.
This guy from this forum had 400 miles on his 327 and was told the main line was fine. HMMMM
Being an OEM guy you probably don't beleive in torque plate honing because OEM does not do it HMMM