You can get away with ART lowers only. Thats what I'm running on mine right now. I'm going to buy uppers too, but I just needed to get my frame flat on the ground for now
Anyways, what you do with the lower control to modify it to lay is; you take and cut off the balljoint, then you move it up and reweld it on with proper gusseting and what not. Last thing you want is for it to break right? and this will keep your ball joint from binding and let the spindle move up higher before the control arm hits on the frame. I'm not sure how much it needs to be moved up, best bet is to tack it on and do a test fit. Make sure the balljoints don't bind.