Preheat oven to 350 F
Grease a 9 x 5 loaf pan
In a medium bowl, whisk together the flour, cocoa powder, baking soda and salt
In a large bowl, combine the eggs, butter, oil, vanilla extract and brown sugar
Stir the dry ingredients into the wet ingredients until just combined
Fold in shredded zucchini until just combined
Fold in 3/4 cups chocolate chips
Pour batter into prepared pan, top with the remaining chocolate chips
Bake for 50 - 60 minutes, until a toothpick comes out clean
Let the bread cool in the pan for 15 minutes. Removed from pan and set on a wire cooling rack to finish cooling before cutting.