Mark,
Engine assembly date (EAD): 4 ? - April ?, 1969. I cannot see the next digit(s) on the stamp pad in the picture. I am going to guess 2?.
The RH engine pad shows E383, with a 4 below. Is there another number that I should look for?
Thanks for the info. While I did get a set of manifolds with the car, they are not the originals. The left manifold has a casting date of February '68 & the right manifold doesn't seem to have the same style casting date & I can't tell what it is. So, I guess I'm on the hunt for some correctly dated manifolds. What date range should I be looking for, March - April?