I agree with thirsty looks stock to me as well. I had an 83 k20 back in high school and ran 33/12.5/16.5 on it with no rubbing. How you ask. Well it had heavy duty rear leaf springs so the back set higher already and then the previous owner had added some additional leaf spring pieces to the front to level it out. Looked as though it had about a 2 inch lift, but set stock.