suspension + tire question

[98Z71GUY93]

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hey guys im new here. for all the veterans yes i have used the search so please dont hate that much. i just had a question about a lift and tire size. i have a 98 z71 silverado, no suspension work at the moment besides the torsions bars cranked a turn and im sitting on 285/75r16 with stock wheels. i came across a set of my favorite early model american racing whells. there 15's i believe. not sure about width or backspace i found them on craigslist. there american racing ar-26 or type 26. i was thinking about just doing wheels and tires but im gonna need a little lift eventually. so i was wondering if i do 3/4 ton leafs in the rear which would bring my rear leaf count from like 3 or 4/1 to 7/1, hopefully that would lift me 2 inches in the rear and crank the torsions level. could i clear 33x12.50r15's or would i need to do 33x10.50r15's. i would like 33x12.50;s because of the broader choices 33x10.50's there isnt much and i want an all terrain tire not a mud terrain. if you guys could let me know, that would be awesome, ill post some pics of the truck and such when i get a chance, thanks a lot
heres the wheels i found

 

[dirtridinz71]

Yes they will fit with 2" rear lift and tbar crank. Unless you haul heavy loads a 1.5" block would be cheaper and ride smoother.

 

[98Z71GUY93]

thanks a lot for the reply, much apprecitated, 33x12.50's it is

 

[Swims350]

285's are 33's so why would they not fit?

big thing is just the wheels sticking out.

you could clear them as is maybe, or you may just need to block and crank, or use other leafs, or add a leafs.