In a small mixing bowl stir together melted margarine or butter, basil, oregano, and pepper; brush over cut sides of bread loaf halves.
Place both bread loaf halves, buttered side up, on a large baking sheet. Top with pastrami slices. In a small bowl stir together tomato paste, chili sauce, green pepper, olives, and green onion; spread over pastrami slices.
Bake in a 400 degree F oven for 15 minutes. Sprinkle with mozzarella cheese, chopped tomato, and Parmesan cheese. Bake for 3 to 5 minutes more or until mozzarella cheese melts and pizza is heated through. Slice each bread loaf half into 8 pieces. Makes 16 appetizer servings.