If I had to do it all over again, I would go with PSC. They build some awesome stuff. I have also seen several of the Howe rams bend where I have never seen a bent PSC ram, even in rear steer. Dont know if Howe cured that problem or not. All PSC systems are balanced, as far as I know.
I dont really know of anyone that builds a kit per say, just for full size GM vehicles. Most of the vendors that do sell full hydro systems also sell mounts and clamps for the rams and small steering links if you are running a double ended ram and want to eliminate the tie rod. Most anyone with fair fab skills can undertake installation of a full hydro system. I have installed two PSC systems, one with two single ended rams, and one with a dual ended ram, and it took me about one day to go from no steering or mounts for anything, and running/driving. The full hydro I run on my buggy is a pieced together system from Howe, West Texas Off Road, and Tractor Supply and it works great although it only has one single ended ram so it is unbalanced.
Edit: BTW, 4x4High, STFU. No one asked for your ignorant pointless posts.