[iluv69s]

I know there are labs that can do some type of test to the metal to see "if the molecules below the surface have been compressed" by a prior stamping. I know there was a vette on Ebay within the last year that claimed to have had this done to the frame and block to prove there was no restamps...I believe it was a 67 L-88..not sure though. He had all the lab reports...maybe someone remembers the auction and you can contact the lab. But I know the FBI does it all the time to check removed serial numbers on guns. It may be worth it to prove originality..