It's called Die-Electric grease. You can get it most any auto parts store. Be sure to put it on the connector for the ECU. It's located between the battery box and the airbox. It's a pain in the ass to get to, but needs to be done also. You can also get from Grainger Industrial supply in small one-use packets, great for keeping in the tool kit.
a lot of autoparts stores have the single use packets near the cash register, get a tube and keep it in a cool place, when that stuff warms up it makes a horrible mess, had one get broken open in my tool box, not a fun cleanup!
one thing to think about also is if you do or not run a snorkel, you can use blue rtv(easy clean up if you have to remove it and reapply) to seal up the airbox and carb boot. and also carquest autoparts carries a spray sealer called Acra-seal, you spray it on your carb to keep water out.