Measure and sift together all the dry ingredients. Cream the sugar and eggs. Add the oil, pumpkin puree, and the raisins to the sugar/egg mix. Add the dry ingredients to the wet mix. Add the nuts last. Fold everything together. Pour into 4 greased and floured (or "sprayed") one pound metal coffee cans. (This is the only way I know how to make the loaves of bread, although I am sure that one pound loaf pans would also work!) Bake at 350 for 1 hour. Cool for 5 minutes in the cans and then remove to a cooling rack to finish cooling. Wrap with plastic wrap and store in the refrigerator for up to 2 weeks. Place in zipper bags in the freezer for long term storage.