Uh, did you say “stock is the best” alignment?
Because factory alignment specs are 100% wrong for radial tires. The worst. They’re even worse for wide front tires.
I’ve been running 275/35/18’s on the front of my Duster for years with a 16:1 Flaming River steering box. You need a bunch of positive caster to offset the effects of the wider front tires. I run +6.5* of caster on mine.
And just get the idea of a rack and pinion out of your head, unless you’re going to spend $5k and replace the whole front suspension with an RMS or HemiDenny conversion. There is no rack and pinion conversion that will work with your stock K frame and suspension that isn’t a total suspension geometry nightmare.