Combine eggs, pumpkin, evaporated milk, sugar, spice and salt. Mix well; pour into an ungreased 13"x9" baking pan. Sprinkle dry cake mix and nuts over top. Drizzle with butter; do not stir. Bake at 350 degrees for 45 minutes to one hour, testing for doneness with a toothpick. Serve with whipped topping, sprinkled with nuts and cinnamon. Makes 8 to 10 servings.