3 O 25 H XXX 25, 1973 (the O is not an O, probably a C or a G)
3 C 30 H March 30, 1973
A.M.17 I don't speak Aussie Ford
0 J 9 G September 9, 1970
1 H 18 J August 18, 1971
1 B 1 G February 1, 1971
3 K 30 K October 30, 1973
9 K 27 DOAE-J October 27, 1969 This is your earliest block
I'm willing at this point to buy into the assumption that those extra holes are a feature that Ford dropped sometime between October 1969 & Septmeber 1970.
I know that Jim Kuntz blocks all the holes in the lifter valley, thus forcing all the oil collecting in the valley to drain forwards through the "rough" knocked-out hole in the front of the valley. Thus lubricating the camshaft thrust plate.
FYI, I know that Jon Kaase, prefers the early 1969 blocks, like your D0AE-J block, because they supposedly have a bit thicker cylinder walls.