1. Preheat oven to 350°. Stir together flour and next 4 ingredients in a large bowl. Cut butter into flour mixture with a pastry blender or two forks until crumbly. Firmly press 2 1/2 cups crumb mixture onto bottom of a lightly greased 9-inch springform pan.
2. Stir together sour cream, egg, and baking soda; add to remaining crumb mixture, stirring just until dry ingredients are moistened. Pour sour cream mixture over crumb crust in pan; arrange pecan halves over batter.
3. Bake at 350° for 1 hour or until a wooden pick inserted in center comes out clean, shielding with aluminum foil after 40 minutes to prevent excessive browning, if necessary. Cool on a wire rack 20 minutes.
4. Stir together orange juice and honey, and brush over top of cake.