for positive camber,the lower control arms would have to be bent.Bent uppers usualy cause neg camber.Is the ride height the same?If the front is higher for some reason, that will camber top out.I have seen saged K-frames,but that usually ends up with neg camber also.If it looks and feels that bad,check for tire wear.If it was driven for a while,there should be evidence of outside tire wear,from the truck up the driveway should not show anything,but if joy-riding,tire wear will be there.Hope there is a simple explanation.