Lisle tool company makes a tool just for gm front wheel drive vans and cars that tilts the engine foward, there are two support connecting the radiator to the radiator valence, they are called dog bones. To use the tool you remove one dog bone and bolt in the tool in its place and remove and set aside the other dog bone. This tool lets you tilt the engine and it holds it in place while you work. I used one on my 1997 chevy lumina to change spark plugs and it worked VERY well. You dont need to disconnect anything either you should just make sure you dont tilt it too far foward and damage somehting. Here is a link to it:
http://www.cartools.com/Merchant2/me...tegory_Code=EG