I saw this on facebook marketplace today and have no affiliation.
1969 DZ 302
stamp V0920DZ
vin 19N514709
Block 3932386
Block date 1208 all rebuild to spec with all GM parts motor has been run on engine start stand
www.facebook.com/marketplace/item/1062768556169365
Seller - www.facebook.com/mike.prusky.71/
There is now a picture of the pad, I asked the seller to add it. It's not a great picture but it's better than what was there previously.
Casting date I 20 8
Engine assembly 0920
Rare case but if the stamping is genuine it was cast and assembled on the same day. Not the first one we have seen like that.