2wd vs 4wd ride height

[Suburban_Tyler]

I'm not finding the exact info I'm looking for. What is the difference in ride height between 2wd vs 4wd? The reason I ask is because I am going to lift my 2wd suburban using the 4" lift spindles from an 88-98 c1500 and lower control arms from a 3/4-1 ton 73-87. It has a broken main leaf around one of the bushings, so leaf springs are a must. I don't think I can just buy a 4" lift spring for a 4wd and expect it to sit level. I think it would be to tall in the rear. Since gm didn't use lift blocks in the 4wd, the 4wd springs must have a little more arch. According to LMC none of the part numbers match between 2wd vs 4wd. What my thoughts are is to get a 2.5" lift spring for a 4wd. I'm trying to avoid using a lift block, or at least not much of one.