Preheat oven to 350 F. Grease and flour 13x9-inch pan.
Combine pumpkin, evaporated milk, eggs, sugar, pumpkin pie spice and salt in a large bowl. Stir until blended.
Pour pumpkin mixture into prepared pan. Sprinkle dry cake mix evenly over pumpkin mixture and drizzle with butter.
Bake 25 minutes;remove from oven and sprinkle with chopped pecans. Tightly cover with aluminum foil and bake an additional 25 minutes.
Cool completely. To serve cut into squares.
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