Do you already have the PML installed?
It should be noted:
1) You don't need a "kit"...you don't need shocks right away...or torsion bars...piecing together and gradually filling in your suspension pieces is the right idea...so you are on the right track
2) The AAL will lift the rear about 3" on its own! It varies a bit by material properties and how much you have your truck loaded down and settling over time, etc...but the point being that if you have the AAL AND the PML shackles...your rear WILL be much higher than the front.
If you go the UCA route, there are 2 basic ways you can go:
1) UCAs in the front, AAL in the back, and REVOLVER shackles (pricey, but AWESOME) for the rear. Revolver shackles don't lift much (website claims 2", but people with them have said it is less), and increase the flexibility that is lost with the stiffer spring pack.
2) UCAs in the front, and the "adjustable shackle" in the rear. With UCAs in the front, the adjustable shackle is set to the maximum setting (2 1/8") This allows you to lift the front a little more than the rear...and level our your rake a little bit.
Also....just remove the rear sway bar...no need for it
Link to the How To in my signautre
And...upper ball joints come with your UCAs