Re: trip preparation
I wouldn't bother fixing things that aren't broke. You could run into unexpected issues in the process of working on it.
I would just give it a good tune up, keep some safety basics in the car with you (tools, tape for hoses, zip ties, blankets, flashlights, maybe a little food and water, etc, )make sure you have good AAA.
At least once a day when you make stops, make sure to check all the fluids. Top off as needed.
Then go for it. That's not too bad of a trip. I've done long trips in old cars before.