Bought 21000 mile 69 dart. Need road trip advice

396 Signet said

I would definitely flush & repack front & rear wheel bearings. Old grease tends to petrify & a failed bearing will stop you. You will need to pull the axles & replace the seals for the rear. I would use some high quality synthetic grease & you won't have to worry about it ever again.

I would also check the cooing system, has coolant been changed?

Looks like a nice car, it should have great reliability.

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Great advice! ^^^^^^^
I would add to it, bring a gas can until you can fix the sending unit on your gas tank. It might be a simple grounding issue.
Bring a basic tool set and a credit card if things get ugly.......:D
It sounds like a great car.
What do you mean by ''the valves chatter''?
Does that mean ''ticking''?
Maybe adjust the valves, they are mechanical tappets and it would be a good time to do it right now, it's probably time anyway. Not a hard job at all.
Oh, and welcome to FABO!