Jerry said it is possible, but when asked at that time we did not know the engine assembly date. I asked him again.
I don't really know. I would say quite possible in a September assembly, but more doubtful by early October.
Pistons are standard? Bearings look original?
If I recall correctly, if an original assembly, the bearings should also be GM bearings, and would have GM part numbers on the backs... If someone were replacing the crankshaft (for whatever reason), they would not likely use GM bearings...