71 GMC 2500 Suspension options

[Hannoverphist]

Hi, I'm new to the forum and I've been working through the threads looking for suspension options. I just bought a 71 GMC 2500 and I'm trying to do the inventory to figure out exactly what I have and what I can do. So far I can tell you this:
-Original 402 was replaced with a 350, trying to figure out what 350 is still a work in process
-TH400 currently being rebuilt
-Dana 60 no idea what gears
-Auto on the floor
-Non-AC car (need to fix that, not an option to not have AC in Houston)
-Bucket seats

I am trying to figure out what stance I want to go with stock, lowered, lifted or leveled and I have found options for all with the exception of a leveling kit. Is anyone aware of a leveling kit for the 71 2500? Or if it's feasible? Thanks in advance this forum has some great insight.