Preheat oven to 350 degrees. Grease a 9 x 13 pan. Combine pumpkin, evaporated milk, eggs, sugar, cinnamon, and salt in large bowl. Pour into 9x13 inch pan. Sprinkle the dry cake mix evenly over the pumpkin mixture. Top with pecans. Lastly, drizzle melted butter over pecans. Bake for 50-60 minutes or until golden brown. Let cool, then top with whipping cream or whipped topping