Chevy 1994 1500 K lift blocks?

Well, seeing as you already ordered the torsion keys I am uming you only need to lift the rear. There are a couple of good options. I always like the shackle flip. This is exactly what it sounds like. It keeps your same ride quality and converts your shackles to compression style. Google it there are alot of kits or what I like about it, if you are mechanical you can do it yourself. Lift block are fine and cost efficent. U bolt are going to rust regardless. I have run blocks in the past and I think 2" blocks would be fine without and coating. All though a quick cover of spray paint(or whatever you want) will delay rust for awhile.