33s or small 35s. Prior to buying tires look at manufacture's site they'll give specs on tires and that will give you an idea. I bought a 4" lift for an 85 K5 from a local shop and probably paid more than mail order. I bought my 2" lift from www.offroaddesign.com and it was cheaper than a local off road shop (even with shipping). I have a pic in the link in my sig of 4" lift w/ 35s on my 85 K5. Good luck,
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.
1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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