ok looked up that intake....
http://image.gmhightechperformance.c...m_manifold.jpg
The ellipse hole next to the runner openings, thats your EGR tube.
The next opening to the rear, that is your egr threaded port. IIRC its 1/2npt.
My first heliarc project was my vette base intake that I made a fubar on
Then I made a rear bumper frame for my camaro. So not much experience as I mentioned. Just putting that up front.