In a large bowl, mix together flour, sugar, baking soda, pumpkin pie spice, salt and baking powder. In a second bowl, stir together remaining ingredients until well mixed. Add pumpkin mixture to flour mixture and stir until all ingredients are well moistened. Pour batter into two 9 x 5 greased loaf pans. Bake at 350 degrees F. for 65 minutes or until toothpick inserted into center comes out clean. Cool in pans for 10 minutes then remove to cooling racks. Completely cool then drizzle glaze over top and sides.
Glaze: In a small bowl, with fork, mix 1 cup powdered sugar, 1/4 cup undiluted orange juice concentrate and 1/8 teaspoon ground allspice until smooth. Drizzle over cooled bread. Makes 1/2 cup glaze.