I have the same spring package and did the 4" landtank caster plates. I haven't aligned it yet. Curious what your numbers come out to be vs mine. Mine were a PAIN to install due to all the drilling through multiple plates of steel. I see the 2.5 plates look much more friendly to install. But totally worth all the drilling, drives like a dream now!
I’ve got parts coming for a front end rebuild and will take it to the alignment shop after that to get measurements. I’m not sure how long it will be but I’ll post up when I can.