1. If you're going to add weight, get some springs that can actually handle it. I have some Eibach Pro-Lift springs that give a 2.5" lift stock but with my bumper, I have about a 2" give or take. However, I had to add a TPS to level out the lean. Take a look at the 883s or similar if you add weight.
2. From my understanding, trim packers are used to fix lean mainly but they add lift.
I used a top plate spacer to fix my lean on my driver front, which gave me about .5" of extra lift. I also used a 20mm trim packer for a 80 Series Cruiser on my 891s to fix the lean. 881/906 would be pretty level I think, personally I like .5"-1" of rake but that's just me due to how much weight I carry. I would go 881/890s but if you don't want that, 881/906 w/ a trim packer or two would look good to me.
3. LBJs are for sure vital to replace; only OEMs w/ new bolts. It's just not worth the risk going aftermarket.
Your UCA's should be okay. However, you may run in alignment issues if you have other worn bushings like your LCAs. (mine didn't align properly without changing those after my lift) If you haven't done your CV axles, they will probably rip once you add that lift. I recommend replacing anything you think should be replaced BEFORE you add your lift (tie rods, ball joints, wheel bearings, etc) so you can fully enjoy it.
4. Why do you want spacers? Just curious is all.
I have some Spidertrax 1.25 spacers on my rig with stock 5-stars. They look good, makes it have a flush stance. You may run into rubbing with your backspacing + spacers. (at-least I think so. Correct me if I'm wrong.)
5. Lots of variables to consider. I personally run 33-34PSI in the front 32-33 in the back on my 265/75R16 E-Load KO2s. (same size as your 17s but a 16" wheel)Do yourself a chalk test to determine what PSI to run that gives you the best tire wear.
Sorry for the lengthy response, hope it helps