Preheat oven to 350. Mix together pumpkin, evaporated milk, eggs, sugar, cinnamon, and salt. Pour into a greased 9x13 baking pan. Layer Dry cake mix over the pumpkin mixture. Sprinkle top of cake mix with pecans. Drizzle top evenly with the melted butter. Bake 50-55 minutes, or until golden brown. Serve either warm, or chilled with cream.