/6 info needed

Yes, he means freeze plugs. The more important question is what numbers are cast into the freeze plug side of the block, but even more important than that are to find the stamped numbers (and letters, there might be) on the block deck extension on the other (distributor) side of the block. It's at the front (№ 1) until late-production blocks, then it moved in some cases to the back. It's not at the oil pan rail level.