In a small saucepan mix the beer and molasses together and bring to a simmer over medium-low heat until small bubbles form on the side of the pan. Do not boil. Pour the mixture into a small bowl to cool.
In a small bowl add the flour, cocoa powder, baking powder, baking soda and salt. Stir to combine and set aside.
In small batches chop the 6 ounces of chocolate chips on a cutting board to create small pieces. It's ok to have some whole chips but adding small pieces of chocolate will melt better.
In a large mixing bowl add the room temperature butter and the brown sugar. With an electric mixer, mix on medium speed until light and fluffy. If using a stand mixer mix with the paddle attachment.
On medium speed, mix in the three eggs, one at a time. Mix just until the egg yolk disappears. Scrape the bowl as needed.
Alternately, add the flour mixture with the beer molasses mixture. Do this in three batches, ending with the flour mixture. Scraping the bowl as needed, then add the chopped chocolate chip pieces.
Pour the batter into the prepared bundt pan. With a spatula smooth the top of the batter.
Bake the cake for 45-50 minutes. Test the cake for doneness by inserting a toothpick into the center of the cake, if it comes out clean or with a few crumbs then the cake is done. If the toothpick comes out covered in chocolate then bake for a few additional minutes and recheck.
Remove the cake to a cooling rack and let cool for about 15 minutes. To remove from the pan gently run a knife around the sides of the pan and around the center cone. Shake the pan a little to loosen more, at this point you should see the cake move. If it is still stuck run the knife around the cake again. Turn the cake over onto a serving platter and lift the cake pan off the cake. Continue to let the cake cool.