What fuel is best?

John Martin said

The trip is from Oregon to Illinois. I plan to do some work on the car before setting out.

Carb rebuild
Spark Plugs
Cap
Rotor
Condenser
Air filter
Oil change
Valve adjustment
Timing

I expect to have to advance and retard timing according to altitude and I will try 93 as well to avoid any issues caused from high-altitudes.

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I'd run it, or at least check things before replacing, exception of the spark plugs.
And depending on its situation, best oil change is usually with the oil warm. Judge whether that's wise when you see it.
I'd bring a couple of condensors and points, but new ones are a crap shoot. If the old ones good - run 'em.
Timing: Bring a light, a tach, golf tee (and a rag). If its the original distributor, set it to factory initial. That will be close. You can make small adjustments if you find its needed while driving. Don't see any reason to use 93 octane. Its not cleaner, it doesn't have more energy, and it costs more.