need info on my engine numbers

the dumb numbers on the starboard side, behind the Alternator read:

B 225 9 21

what year is this engine? i am not the PO so i am beginning to think (who me!?) that this engine is not the original one on my 66 Valiant.

numbers on the block: 081 95 2468430 - 11

stay safe.
thanks
G&U