Preheat oven to 325. Grease loaf pan. In a large mixing bowl cream together butter and sugar. Add eggs and pumpkin. Mix until just combined. Combine flour, baking powder, cinnamon, cloves, salt, and baking soda in another large bowl. Slowly mix dry ingredients into the wet ingredients. Mix well. Fold in nuts and raisins. Pour mixture into loaf pan. Bake for 1 1/2 hours or until toothpick comes out clean. Let cool completely before removing from loaf pan.