Have you looked to see if your steering linkages have any interference or binding?
hard to tell without pics.
May need steering link from the pitman arm to the steering arm needs to be changed with a drop link.
Like this for example http://www.carjunky.com/partstore/?N=0&Nr=AND%28make:Chevrolet,model:K10,year:1986,brand:Pro+Comp,sku:E37GDL40,part:Drag+Link%29&cid=M1172623864W45e4d1f8afe06&cjid=cj15830531084b81cb2eb1562
and I know this may sound stupid, but did you make sure that your steering box was turned to the middle and not all the way to the right? just something that I did on my bug that drove me nuts for a few minutes.
last thing is
The link from the steering box to the driver side steering knuckle is either adjusted wrong, or it needs to be changed out.
I'm guessing you didn't take it to the alignment shop afterwords. This is ABSOLUTELY NECESSARY.
The alignment tech will change your caster/camber to reflect the new lift (because, yes it DOES affect these things when you add a lift).
AND, HE WILL CENTER THE STEERING BOX FOR YOU. Centering the steering box is ONLY DONE with the link between the steering gear and the driver side knuckle.
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