In a small saucepan, bring all ingredients for fudge to a boil. Cool.

Pour half of pound cake into pan. Pour half of fudge over cake. Repeat with remaining cake and fudge. Mix gently with fork to create marble effect.

Bake at 300 degrees Fahrenheit for one hour and 40 minutes. Cool.

Preheat oven to 300 degrees Fahrenheit with nine-inch bundt pan inside.

Prepare the cake batter: Cream butter and sugar until fluffy. Add eggs, one at a time. Add remaining ingredients until smooth.

Bring all ingredients to a boil. When slightly thickened, pour over cake. Refrigerate.