In a large bowl, stir together cake mix, pudding mix, eggs, sour cream, oil, and 1 1/2 cups chocolate chips. Mixture will be thick!
Spread half the batter into a well-greased tube pan or bundt pan.
In a small bowl, whisk together granulated sugar, brown sugar, cocoa powder, and cinnamon.
Sprinkle half the streusel mixture over the batter in the pan.
Swirl lightly with a knife.
Spread remaining batter into the pan.
Sprinkle with remaining streusel mixture, and swirl lightly with a knife.
Bake at 350 degrees for 40-50 minutes, or until edges are golden, and a toothpick inserted near the center comes out clean.
Remove to a wire rack to cool.
Cool for 10 minutes, then run a knife around the edges to loosen bread, and invert onto a serving plate to cool completely. Do not cool bread completely in pan - it will stick!
While bread cools, prepare ganache.