In a bowl, combine sugar, eggs, pumpkin, vegetable oil, and vanilla. Set aside. In another bowl, combine flour, spices, baking powder, baking soda, and salt. Add the dry ingredients to the wet ingredients. Fold in chocolate chips. Spoon into 2 greased and floured 8 x 4 inch loaf pans. Bake at 350 for about 60 minutes. Cool for 15 minutes before removing from pans to wire racks.