Everything you need is here. Go under Grand Prix, then under gaskets and adhesives. You'll need - an L36 Upper Intake Gasket, Lower Intake O-rings, Lower Intake Manifold Gaskets and a Throttle Body Gasket. The coolant elbows and a tube of RTV Ultra Copper you can get either through ZZP or from you local part store for a little cheaper
You will want
Lower intake gaskets (I'd suggest dealer/Intense Racing for better fitment)
Coolant elbows Dorman #47065
Upper intake (Rockauto Dorman kit as it comes with almost anything you need for the job)
Can of brake cleaner
Can of throttle body cleaner
One tube of Permatex ultra copper RTV
That should do it for a UIM/LIM gasket replacement. The Dorman kit has fuel injector o-rings and all the goodies that you'll need to do the upper. It'* a good setup and at Rockauto prices plus the discount code for the forum,it'* about $85 shipped.
00 Regal GS: All kinds of cool stuff.