Toss salt and spices together in a small bowl and rub all over the pork.
Cover and refrigerate for at least two hours or overnight.
Set oven to 300°F. Bring pork out of refrigerator about 30 minutes before you're ready to cook.
Place on a wire rack fitted inside a rimmed baking sheet and roast for about 40 minutes per pound, or until the internal temperature reaches 180°F.
Once the pork has reached the right temp, turn the heat up to 450°F and cook for another 20 minutes to brown the exterior.
Rest the pork on a cutting board for at least 15 minutes before carving and serving.