What does this engine number mean?

What does this engine number mean?

So it was done on e day shift & so on, but the flat pad above the oilpan is blank,I sanded off all paint with a rather fine paper & there's nothing there.
But I was thinking that since it's black & has a two barell intake it seems to me as an typical van engine. (pickups aint that awfully common here but vans are)