I do mine in my SMo66 at 225 for about 5.5 hours. I flip and rotate them at about 3 hours (quickly so as not to lose too much heat). Toothpick test and check for meat receding at the bone for doneness. I don't worry about losing smoke when I flip them since they're at or near 140F, where they won't take on any more smoke anyway. I never foil ribs.