Look for a thread I started almost a year ago.
Even with new springs, some trucks do still sit lower on the drivers side. I had to add small spring spacers to the front left corner to level it out. I will be converting to bags in front soon and will just run extra air in the same corner to level the truck.
Edit.... Here is a link to my thread.
http://67-72chevytrucks.com/vboard/s...d.php?t=614923