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They consistantly used a certain diameter cutter to machine the pad.

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Which gets dull over time, the finish from a fresh milling cutter will look way different than one that's worn and ready to be changed.

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but the non-believers don't want to hear...
I based my observation as a retired machinist plus owning a few mopars helps. I know what caused the swirl marks but it would lead to others questioning(doubting) me on that too.
I go back to my first post.. cutter speed, wear on it and set-up... also shift change and maintenance.
I've seen many original blocks with marks like that.

How many big blocks were made? over 7million and all the same?
You haven't seen that so therefore it's a fake?

I've got a '68 casting block('69 production) but with a '66 stamp. Is it a fake? No. It was stamped wrong.

last comments.. It could have been removed by someone. On all the blocks I've seen... Chrysler machined the vin pad parallel to the side of the block. To REMOVE all the vin, the cutter or grinder has to be set at an angle which will clearly show it's not parallel.
I would like to see the block up close..