I have a QA1 k member, UCA's, adjustable strut rods and stock LCA's with Proforged greasable LCA pins. I have an easy 5.5-6" of travel and the front end it not slammed on the ground. 5-6 degrees of caster should be no problem. I dialed in 4.5 in about ten minutes so with some strut rod tuning you will be able to gain positive caster.

I used Proforged ball joint and ties rods with aluminum tie rod adjusters. The drag link, idler arm and pitman arm have been changed to the 73-76 -style for header clearance.

I have used QA1 stocker star shocks as well as Viking DA's with good results with a 4 speed on an unprepped surface.

You should have no issue obtaining your goals IMO.