Combine flour, sugar, cinnamon, nutmeg and cloves. Combine sweet potatoes, oil, eggs and vanilla. Stir the wet ingredients into the dry just until moistened. Fold in raisins or craisins. Transfer to two greased 8x4x2 load pans. Bake at 350 degrees F for 55-60 minutes or until a toothpick inserted near the center comes out clean. Cool for 10 minutes before removing from pans to wire racks.
**As a substitute for each cup of self-rising flour, place 1 1/2 teaspoons baking powder and 1/2 teaspoon salt in a measuring cup. Add all purpose flour to measure one cup.