Preheat the oven to 350℉. Place the oven rack on the bottom third of the oven.
Mix together dry seasonings and rub the mixture around the outside and bottom of the roast. Place the roast in a roasting pan. Cover the tips of the bones with foil to prevent scorching.
Place the roast in the oven. For a 13-pound roast, cook for approximately 3 hours and 30 minutes. Cook until the internal temperature reaches 150 degrees Fahrenheit using a meat thermometer. Be careful not to touch the bones, and insert it into the thickest part when checking the temperature.
Remove roast from oven and cover with foil to rest for 15 minutes. Set roast on a cutting board and slice between each rib evenly to cut pork chops.