Preheat the oven at 325 degrees F (165 degrees C). Grease and flour two 9x5-inch loaf pans.
Beat eggs well in a large bowl. Add oil, brown sugar, zucchini, and vanilla; stir well. Blend in flour, cinnamon, baking powder, soda, and salt. Stir in raisins and nuts. Pour batter into prepared loaf pans.
Bake in the preheated oven until a cocktail stick inserted into the center of the cake comes out clean, about 1 hour.