Need help to ID a 454 block

[Pantera]

I have found a CE replacment block with 363?06 number after the CE.

Has GM10 on the back
3999289 = 72-75 454ci two or four bolt block.

B 22 ?A? or "O" then what looks like a 13 that is crooked and yet doesn's look like like numbers at all. Perhaps a letter or something?

The O could also be a rivet or something like that. hard to get a real good look at it.

I know the block is gona be fine to buy but was just wondering what the rest of the numbers were?



Pantera