Preheat a charcoal grill to medium-high (about 450°F). When briquettes are covered in gray ash, push them to one side, and scatter hickory wood chunks over coals. Place pork, fat side down, on oiled grate directly over coals, and grill, covered, until browned, about 10 minutes. Turn pork, and move to side without coals. Grill pork, covered, 30 minutes, turning twice. Brush with 1/3 cup Blackberry Glaze, and grill, covered, until a thermometer inserted in thickest portion of pork (away from bone) registers 145°F, about 25 minutes, turning and brushing with glaze twice. Remove pork from grill, and let rest about 10 minutes. Slice into chops, and serve immediately.