Preheat oven to 325 degrees. Microwave chocolate baking squares in a microwave safe bowl at HIGH for 1 minute and 15 seconds or until chocolate is melted and smooth, stirring at 15 second intervals. Beat butter at medium speed with a heavy duty electric mixer 2 minutes or until creamy;. Gradually add granulated sugar, beating 5 to 7 minutes or until light and fluffy. Add eggs, one at a time, beating just until yellow disappears after each addition. Stir in melted chocolate, chocolate syrup and vanilla until smooth.
Combine flour and next 3 ingredients; add to butter mixture alternately with buttermilk, beginning and ending with flour mixture. Beat at low speed just until blended after each addition. Pour batter into a greased and floured 10 inch tube pan.
Bake at 325 degrees for one hour and ten minutes or until a long wooded pick inserted in the center comes out clean. Cool in pan on a wire rack for 10 to 15 minutes; remove from pan to wire rack and let cool completely. Sprinkle with powdered sugar and garnish with sliced almonds