Baked Ziti with Meatballs

Name: Baked Ziti with Meatballs
Ingredients: 2 tablespoons olive oil; 2 medium onions (chopped); 4 cloves garlic (minced); 3 28-oz cans crushed tomatoes; 1 1/2 tablespoons fresh basil, (chopped); 1 1/2 teaspoon dried oregano; Salt (to taste); 2 large eggs; 1/2 cup grated Parmesan cheese; 1/4 cup seasoned breadcrumbs; 1/4 cup fresh parsley, (chopped); 1/4 teaspoon salt; 1/4 teaspoon ground black pepper; 1 lb ground beef ((I used 80/20)); 1 lb ziti; 15 oz ricotta cheese; 4 oz mozzarella cheese, (shredded); 2 tablespoons butter, (cut into 8 equal pieces); Fresh basil, (for serving)