If your car came with Dexcool then stay with Dexcool and yours didn't. Go with the green and 70/30 or 80/20 mix with water wetter(Redline or Royal Purple) like stated above.

Buy a few cans of spray carb cleaner/braker cleaner to clean things up (OR) take the heads to CNC in Clearwater on Ulmerton and get them to dip, deck, 3 angle valve job, and pressure check for $185. While you are at it, get it ported for $400 more. LT1 heads need it.

Have fun taking the heads off in the parking lot. FYI - There are 2 bolts that go thru the alternator bracket that go into the pass head and vent tubes bolted to the back of the heads.