Preheat oven to 325°F.
Grease and flour a 12-cup bundt pan.
In a medium bowl, combine flour, salt, baking powder, and baking soda.
Combine the milk, vanilla, and 4 tablespoons bourbon.
In large bowl, with mixer at medium speed, beat brown sugar and 1/2 cup sugar until lump free.
Add butter and beat at high speed until light and creamy, about 5 minutes.
Add the eggs, one at a time, beating well after each addition.
At low speed, alternately add flour mixture and milk mixture, beginning and ending with flour mixture.
Pour batter into prepared pan.
Bake 1 hour and 20 minutes or until cake springs back when toothpick inserted in center comes out clean.
Cool cake in pan on a wire rack for 10 minutes.
Remove cake from pan.
Frosting:
In small bowl, combine orange juice, 1/3 cup sugar, and 2 tablespoons bourbon.
Brush mixture all over warm cake.
Cool cake completely.
Garnish with berries or other fruit for a pretty presentation.