Preheat oven to 425°. Cook pasta shells according to package directions for al dente; drain., Meanwhile, in a large bowl, mix goat cheese, basil, Parmesan cheese, garlic and salt. Spread 1-1/4 cups marinara sauce into a greased 13x9-in. baking dish., Fill each shell with 1 rounded tablespoon cheese mixture; arrange over sauce. Pour remaining sauce over shells. Sprinkle with mozzarella cheese. If desired, make X's over the top using crisscrossed zucchini strips., Bake, covered, 25 minutes. Bake, uncovered, 5-10 minutes longer or until heated through and cheese is melted. If desired, warm additional sauce and serve with shells.