Preheat oven to 350 degrees F. Grease and flour bottom only of 9x5-inch loaf pan.
In large bowl, combine brown sugar and margarine, beat until light and fluffy. Stir in zucchini, pineapple and eggs. Add flour, Clabber Girl Baking Powder, baking soda, cinnamon, salt and allspice; mix well.
Pour batter into prepared pan; bake at 350 degrees F. for 60 to 70 minutes.
Cool and frost with glaze.