Sprinkle roast with garlic salt. Insert meat thermometer, being careful not to touch bone or fat. Grill 6 to 8 inches from hot coals for 3 1/2 hours or until meat thermometer registers 170°. During last 30 minutes of grilling time, turn and baste frequently with Baked Orange Glaze. Let stand 20 to 25 minutes before carving. Serve with glaze.