First, prepare your seasoning by combining 2 tablespoons of salt, 1 tablespoon of paprika, 1 tablespoon of garlic powder, 1 tablespoon of onion powder, 1/2 teaspoon of cayenne pepper, 1/2 teaspoon of oregano, 1/4 teaspoon of black pepper, and 1 teaspoon of MSG (optional). Season the 4lb chicken generously with this mixture. Next, stuff the chicken with leeks, lemons, and dill/thyme. Place the uncooked, seasoned chicken in the fridge and let it rest for 12 hours. Preheat your oven to 400F. Roast the chicken for 10 minutes at 400F. Then, reduce the oven temperature to 350F and continue roasting until the inner breast reaches an internal temperature of 165F. Once cooked, remove the chicken from the oven and let it rest for 15 minutes before serving.