I would go on down and replace the lower intake gaskets also. They seem to be a problem area also. When I did my upper intake I replaced the gaskets and they looked really bad. On the motor I just bought (to put in my car after spinning a bearing) only has about 50,000 miles on it and the lower gaskets were already starting to get distorted on it also.
If you need any more info you can check out my post.
Here is what the original gaskets looked like in my 1996 at about 125,000 miles
Here is all the part numbers I used.
Dorman Upper Intake 615-180
Fel-Pro Lower Gaskets MS95809
Fuel Injector O-Rings 2-12093 (Napa Part Number)
Plastic Elbow From Lower Intake 24503423 (GM Part Number)
If you go on down to the lower gaskets be careful when pulling it out of there. There is a plastic elbow on the front of the engine (to the left of the car) that goes into the tensioner pully it will break pretty easily. The part number is above if you end up having to buy that peice.