'70 C10 too low.

[Smokintire70]

I don't know about you but slammed trucks are not my thing. I want my C10 to sit up a little bit. I'm putting 31s on the rear and 29s on the front on a set of Slot Mags. I want it to sit like a 3/4 ton. I'm doing a five lug converision, would this be a good time to change springs? I'm not sure how to set it up a tad. Maybe 3 inches is good, whatever I can get. This is my first post so try to be understanding. I've heard of people using C20 springs, lift kits, spacers etc. I'd like to make the suspension slightly stiffer. It kinda floats on the freeway. Any help is welcome. Thanks.