Pumpkin Pie Crunch

solid pack pumpkin 1 (12 oz) can evaporated milk 3 large eggs 1 1/2 cups sugar 4 tsp pumpkin pie spice 1/2 tsp salt 1 pkg Duncan Hines® Moist Deluxe® Golden Yellow Cake Mix 1 cup chopped pecans 1 cup butter or margarine, melted whipped topping