I'm getting my 94 Suburban ready to take to my son who is in the army.
My question is what else would you recommend doing to the engine since he doesn't work on cars and it needs to be reliable. It has 216,000 miles on it and I just check compression and all 8 are around a solid 140. It has had a recent tune up, plugs, rotor, battery, fuel pump, air filter, tires, brakes, exhaust. It starts and runs good.

Anything else I should do before driving the 700 mile trip?

Also, what do I do with old gas? Had to pull the fuel tank to stop a line leak and has about 5 gallons of older, dirty gas. Is there somewhere to take it to recycle or a safe way of disposing of it?