Timing problem

Diff gear oil and trannie gear oil may accumulate moisture, which will acidify the gear oil and can etch bearings and gear surfaces. So I would eventually drain it out and renew just for purging any accumulated moisture. If you are west of about the 100th parallel, things are a lot drier and this is not much if an issue. But east of, say, Oklahoma City, that moisture may get in there.

The ballast will not go bad sitting unless you see any obvious corrosion on the contacts. Make sure you have an OEM ballast or at least and MSD 0.8 ohm (cold) ballast; the Mopar system uses are a very low ballast resistance (0.5 to 0.6 ohms cold for the OEM one) and there are a lot of higher resistance ballasts that folks get a hold of by mistake, which will weaken your spark.

Spark plug wires don't typically go bad just sitting, but the rubber/insulation may get hard and be more prone to breaking down. So, it would be on my 'eventual' list to renew. Plugs do weird things, so they would get replaced too, if the engine is a performance one. (Plain-jane stock compression engines seem to be effected less.)

Yes, good thinking: squirt some new grease into the U-joints to force out any that may have hardened up a bit over 7 years.

Same for balls joints and tie rod ends. Rubber boots may be all cracked and shot by now. Sounds like a front end bushing and steering joints rebuild may be in order; with an alignment. Might be a good time to look in to putting in offset upper control arm bushing to get more caster than stock to make it more directionally stable at high speeds. I don't mind the old low caster angle steering (probably 'cuz I grew up on it), but many folks don't like the feel. There is a lot of good info on the Suspension forum here.

That is quite a story you have there..... hope it all works out good in the long run.