rhaigh08--
There's another member of the forum named krivasauto who is currently doing a headgasket with the engine in the car and documenting it at his shutterfly site. Look down below on the first page for info on this.
His shutterfly site is
http://99intrigue.shutterfly.com/. He's got a lot of time into the Intrigue 3.5. Personally if I was in an engine rebuild situation I might see what I could get a low milage engine for and do a swap. There's several custom GM tools to remove the heads, hold the flywheel, and install the crankshaft balancer seal and pulley. These can be obtained off ebay.
If you've got oil in the spark plug holes it's leaking from the cam covers. There is gaskets in there that seal each individual spark plug. Front cover is fairly easy, and was documented on this site by LittleHoov. Do a search on posts started by him.
I believe that krivasauto also has some pictures of the removal of the cam covers for his front headgasket job.
Check out the shutterfly site. He has a lot of pictures posted. Several hundred total.
Good Luck and keep us posted on what you end up doing..