My '97 went to .7ish on each side when lifted to just 21.5" or so wheel centers to flares. I'd guess that's less than 1.5" from stock so my front axle was already on the low edge of, or out of spec to start.
I'd anticipate that you will need minor caster correction and you may be well served with the lower lift height land-tank plates or the washer mod but delta could of course fix you up with some arms. I wouldn't anticipate driveline vibes from minor caster correction but you never know.
Best approach is probably to install all accessories, tires, lift and then have a shop get your sweep/caster numbers for you. You never know for sure how much height a lift will deliver, what your numbers will be, etc. so you won't know how much correction you need til the setup is finalized.
New arms from Delta really are your best option for correcting caster without the risk of tie-rod to arm interference, axle mods, etc. but washer mods, plates, bushings and bearing changes for caster correction all have their place as well.