[SilverTwin]

I was finally able to get a little more info on the block, the number by the oil filter housing is 3963512 and the date code is H2570 if I'm reading it correctly. The block has been decked so I was not able to get the serial number from the front of the block.

Does the date code help narrow down if this in indeed a COPO block as originally thought?

Thanks for any assistance,
Tim