In a large mixing bowl, add the eggs, and sugar, and cream together until light and fluffy.
Add the brown sugar, orange zest, canned pumpkin, oil, and vanilla, and blend well.
In the middle/on top of the pumpkin/egg mixture, add the flour, baking powder, baking soda, cinnamon, allspice, and salt, and blend the dry ingredients together right on top of the pumpkin mixture, and then blend the flour and spices into the pumpkin mixture until well blended.
Add nuts and raisins at this time, if desired, and blend into batter.
Set mixture aside, and place parchment paper in the bottom of a 9 inch Spring-form pan.
Fill the bottom of the pan with the batter, about an inch deep.
Butter the bottom and sides of a loaf pan, and flour the pan, and tap out any excess flour. Pour the remaining batter in the loaf pan.
Place the Spring-form pan, and the loaf pan in the oven at 350 degrees for 45 - 55 minutes, or until a toothpick inserted in the center comes out clean.
(The Spring-form pan may be done before the loaf pan, so watch them closely).
Once the pumpkin bread crust is done (and the loaremove from oven to a wire rack to cool.