Upper intake (Plenum) question 97 88 LS

[46u]

I got the old plastic upper intake (plenum) off my 1997 Olds eight eight. When I took it off the gasket and everything came off. No real problem but leaves me with a question. As most know the gasket is a thick plastic gasket that has a bead on each side. Going from front to back there are two plastic supports that hold a pipe. I am guessing one end is open to the cavity and the other end goes into the hole going to the PCV is this correct? I looked in my manual and did a search online but could not find anything that confirms this. Too muck to have to take the new one off later so please advise me.
Thanks!

[maxwedge]

Correct, while you are in there, remove the 2 inside corner lower int. bolts ans seal them with rtv, oil can migrate up these bolts.