Preheat oven to 350F. Grease a 10 inch tube pan and set aside. For the cake, sift together flour, baking powder, baking soda and salt. Cream together the butter and sugar until light. Beat in eggs and then vanilla. stir in sour cream and then the dry ingredients. For the filling, beat the cream cheese and sugar. Beat in the egg and vanilla. Stir in the chocolate chips. Spoon half the batter into the pan, add filling, top with the remaining batter. Bake for one hour.