The best ever Southern Texas BBQ brisket

4-pound brisket
2 tablespoons kosher salt
3 tablespoon olive oil
1 tablespoon black pepper
1 tablespoon paprika
1 tablespoon chili powder
¼ teaspoon cayenne (optional, for extra spice)
1 tablespoon garlic powder
1 tablespoon onion powder
½ teaspoon dried oregano
½ teaspoon dried thyme
2 teaspoons dry mustard
2 tablespoons brown sugar, separated
2 cups beef stock
2 tablespoons ketchup
2 tablespoons barbecue sauce
Preheat your oven to 350F, and position the oven rack in the second-highest slot.