In a large bowl, combine the flour, cinnamon, salt and baking soda.
In a separate bowl, beat the eggs, sugar, pumpkin and oil. Stir into dry ingredients just until moistened. Fold in 1 1/4 cups chocolate chips (reserve the other 1/4 cup for the topping).
Pour the cake into a greased 9×13 pan.
Mix together 1/4 cup sugar and 1/2 tsp. cinnamon and lightly sprinkle over the cake. Sprinkle the remaining 1/4 cup chocolate chips on top. Bake at 350° for 45 minutes, or until a toothpick inserted near the center comes out clean.
Cool for 15 minutes before serving.