Below is a list of VINs that were "scheduled" for 10/8, one at each of the assembly plants.
Personally, I'd look for a block with 0G120000 to 0G150000 VIN stamped on it (440HP block)!
It would've been in the St. Louis plant at the same time.
SPD A08 (10/8/69): 440s:0A141489 - all b-body all
HP0B155671 - all e-body all
HP0C139408 - all c-body
~0D137000 - all c-body
0E110554 - b & e-bodies all
HP~0F140000 - all c-body
0G139184 - all b-body all
HP~0R142000 - b & c-bodies
c-body 440s can be originally "blue" non-HP or "orange"
HP engines (BEWARE: restamps a plenty!
)