[Held for Ransom]

Mystery cable looks like the antenna cable.
Date coding of newer windshields hasn't been looked at too closely as far as I know (bottom code is the pattern of the glass). 255 could be the code, like 25th week of '85 or something like that.
If your going like the first car, then the Formula wheel has to be shelved.
Going back to 3.08:1 will more than likely need the convertor swapped too.
Air cleaner looks original other than the decal, all black. You can search it for date stamping (a green/blue/teal ink). Of course a picture of the underside would help. Is the original "Keep your GM" decal still there?
Try to get the date code stamp reading of the original Rally II (HM) rims and jot them down. It's always fun to keep an eye out for duplicates.
Take a picture of the A/C compressor decal, in case something happens to it during rebuild.
Frame connectors are welded in and not hurting anything. I'd leave them alone.

Bob is on track with a priority list. I wish I had done that.
To me though, interior is to be tidy first (you can't keep the hood down on that).