Yup, little notches in the ends of the manifold flanges. Correct?

edit: A small block would need the walls cut down side to side of the block if the block deck was surfaced. Or the whole length of the front and rear ends of the manifold cut.

edit 2:

I keep thinking 'end of manifold' instead of 'end of flanges'. Oh well, trying to think of this situation while watching the hockey game isn't all that easy sometimes. lol