Went to the commissary today to pick up the 5.5 lb standing beef rib roast that I had on order, and was presented with a 5.5 lb boneless beef roast - they had run out! Was going to cook it using a Cooks Illustrated recipe which calls for browning on the stovetop, then slow roasting at 250 rib-side down. Well, there are no ribs!! So, should I put the roast on a rack? Any guess what no ribs will do to the cooking time? Any good ideas? Need help before New Year's Day when I plan to cook it. Thanks!!