Ahem, I do have the correct Dated WQ block, manifold, heads and even the correct oil pan, so good for me I guess.
But when it comes to having the correct numbers match, the way I understand it, 1968 is the first year this could even be done.

1967 and before cars had numbers to identify when they were made and what cars they were in but had no numbers proving they are in the right cars. So anyone with these cars could claim numbers match by just having a correct block an no one would know the better. Darn these manufactures for know how much you guys would care about the EUN.

Also for all you know it alls and jealous people the block wasn't the only identifier of the HO series there was an "HO" stripe so don't tell me it was just the block that Identified it because you are wrong!