[69LM1]

I am looking at buying this block, what can you guys tell from these numbers? Vette or CoPo, or either? Any help is appreciated!!!

-The casting numbers at the rear of the block are "3916321"(it has 4 bolt mains).

-The casting date is hard to make out but looks like "1 27 7".

-The stamped numbers on the front deck looks like "TI0I6TH"

-There is a partial vin on the block that reads " 18J282724"

-The crank is forged, cross-drilled and ".010/.010.

-The rods are 7/16 full floated dimple rods.

Rich