Actually it's 8 rows of 8, over 500 measurements but the block was bored .090 and I diligently searched for a thin spot. There were many that thought that block would be junk. For what ever it's worth, it was a replacement 58 truck block and never had numbers stamped into the pad like yours has.
I think I used a silicon grease for the paste and I was able to mechanically measure several parts of the cylinders through the water jacket to verify the readings I were receiving were accurate.
I figured I didn't want to go thinner than .125, especially on a thrust side. I got that number because that's the thickness of a lot of sleeves (when sleeving a block). Might be able to be thinner....