Tom, it crossed my mind that all 5 of them might have been factory stamped. I had had bought another ZL1 block from Lamar at the same time & the stampings looked totally different.
I feel certain that when Reggie & Lamar met they discussed repairing the block so Reggie might buy it. Reggie's happy knowing that he has 1 of 2 'factory sponsored' ZL 1's.
It's the 3rd party's involvement that has upset the apple cart. I'm assuming he might have one of the 4 extra blocks, & just like me, thought he had purchased the original one. This will play out in time.
BTW I like Lamar & in no way was this thread meant to tarnish his image. He's always treated me fairly.
It could be that the buyer learned of the sheet metal replacement on the car & has used the 'non orig block' issue to get out of the deal.