55firstseries,
Thanks for the kind words and follow on pics of the head. I will breath a small sigh of relief that I haven't lost my marbles (yet - LOL).

From "No1300"s post, it sounds like your block casting date info will remain hidden until you get around to removing the intake/exhaust manifolds. Many thanks to "No1300" for adding these tidbits of info on Canadian engines!

Keep us posted as you can on further info.
Dan