Raising partial VIN after block is decked

[iluv69s]

I remember a few years ago a 67 vette that had labrotory documentation that the original VINs on the block and frame had not been restamped over. They apparently did some acid etching type test. I believe it was an L-88 or L-89 car. I did a search, but cannot find it.
I also had contacted a scientist here in Pa at one point about ten years ago that did such tests. I will have to look for his number. I believe his last name was Klauser..??
If I come up with anything, I will post.