I have some part numbers if you want to go completely with GM gaskets and supplies. There may be some extra stuff on here that you may or may not want to do while you change the LIM gaskets. Several of these I went ahead and changed even though they were probably alright. I used the newer style aluminum LIM gasket kit. These part numbers are for a 98 GTP.
LIM gaskets 89017825
Yellow O-rings 24501563 (part number is for one, you will need 2)
Supercharger gasket 24503911
LIM end cap gasket 24505049 (may not be necessary, but I had my LIM
chemically cleaned so I took everything off of it)
Throttle body gasket 24503648
Coolant Elbow 24503423 (97/98 model only has the upper elbow)
Fuel injector O-ring kit 12537425
Thermostat gasket 24502433
Thermostat and rubber O-ring Purchased from ZZP
Engine Sealant for corners of new LIM gaskets 88861417
PTFE Thread sealant for LIM bolts and Thermo housing bolts 12346004
Valve cover gaskets 24503937 (Not necessary, but might as well change
while you are there, especially the back one if you haven't already, part
number is for one gasket)
New Radiator cap 24506225 (Not necessary, but with 125,000 on the car
I figured it needed changing)
Temp sensor that threads into LIM 10096181
Vacuum line assembly from MAP to Boost bypass 24508742 (I broke this)
1 gallon of Dex cool and 1 gallon of distilled water (if you completely drained
the block like I did)
5 Qts of your favorite oil and filter for oil change after the LIM gasket install
I also bought a cheap quart of oil to pour down the lifter valley to get any excess coolant or debris that dropped down in there, some razor blades to scrap the old gaskets off the LIM and Supercharger, plenty of shop towels, and some starter fluid to clean the surface of the heads and any other gasket surface before install
I am going to change the oil again in app. 100 miles to be for damn sure all the coolant is out.
I just thought I would add this in case it might help somebody. Thanks to Dubob for his help during this install and for making the video and Allen K for filming it.
