Does this sound normal?

First off, that's probably not a hipo 340 manifold. ALL of the later ones I have ever seen have a strengthing rib like this one. Also note where the heat riser shaft hole is. There is another hole for it on the opposing side. I'm not saying it's not a 340 manifold....because Lord knows I ain't seen it all. BUT, I have NEVER seen a later 340 manofold without that rib. Never. Here IS a later 340 manifold.