The xxxyyyyy's most likely indicates for certain that it is a "last of" the D2AE-CA castings, but whether it is drilled for four bolt mains and actually has the caps has not yet been proven!

Remember that this casting saw use in anything with a 351C after 1972....2-bolt or 4-bolt applications.....
I have little doubt that it doesn't have 4 bolt caps.....but to be sure, you either need to drop the front timing cover off, or drop the oil pan so you can look-see!!!
VERY CLEAN motor!!!! Musta been running synthetic oil or something!
Steve