Not to answer my own questions, but
I found this:
EXAMPLE OF SERIAL NUMBER. (THIRD SET OF NUMBERS)
9105B—-> 9= the year of manufacture–1989
105= the calendar day the engine was manufactured–April 15
B= the line and shift the engine came from.
So that would mean
My motor was produced April 1 1988?
the double zeros indicate day 1? can't be anything less than the first day?