Sift together flour, baking powder, baking soda, salt, cinnamon, cloves and sugar. Add brown sugar, shortening, buttermilk and pumpkin and beat 2 minutes. Add eggs and beat 2 minutes longer. Turn batter into greased and wax paper lined 9"x13" pan. Bake at 350° for 35 to 45 minutes, or until toothpick inserted in center comes out clean. Cool a few minutes and remove from pan.