Melt the margarine and set aside. Combine the sugar and baking cocoa in a bowl. Stir in the evaporated milk, eggs, melted butter or margarine, and vanilla, blending well. Stir in the coconut and pecans and turn into two unbaked pie shells. Bake in a 180ºC . oven for 40 minutes or until set around the edges. Cool on racks. Makes 2 pies of 6 servings each.