need some help deciding on a 2" or 4" lift for 1987 k30 srw

[324matt]

I have aquired a 1987 chevy SRW 4x4, 454 400th np205 4.10 gears. The truck only has 74k original miles and is bone stock. It has 3 leafs in the front and 9 leafs in the rear. I want to lift the truck either 2" or 4" depending on what the pro's and cons are of each. I want to retain the factory gvw, yet at the same time put 18' or 20' wheels with proper backspacing on them to clear. Im also wanting to run a 33.5"-35" metric tire. Ive looked at a few suspension lifts, but would like the opinions of all of your expertise! Thanks for your opinions-advice
-Matt
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