Heat oven to 350°F. Grease and flour 10-inch tube or 12-cup fluted tube cake pan. In large bowl, combine cake mix, 3/4 cup milk, 1/2 cup margarine and eggs; beat at low speed until moistened. Beat 2 minutes at high speed. Stir in 1/4 cup coconut and 1/4 cup nuts. With spoon, marble chocolate through batter. Pour half of batter (about 2 cups) into greased and floured pan.
In small bowl, combine all filling ingredients; reserve 1/2 cup filling. Sprinkle remaining filling over batter in pan. Cover with remaining batter; sprinkle with 1/2 cup reserved filling.
Bake at 350°F. for 55 to 70 minutes or until toothpick inserted near center comes out clean. Cool upright in pan 30 minutes. Remove from pan. Cool 1 hour or until completely cooled.
In small bowl, blend all glaze ingredients until smooth, adding enough milk for desired drizzling consistency. Drizzle over cake.