Chocolate Pound Cake- McCall's Great American Recipe Card Collection

So much for the good for you apple. I am now going to start posting some chocolate recipes. May not so good for you but oh so yummy. This one is from a 1973 recipe card set. I only have a few of the cards so I think it was a complimentary set.

Chocolate Pound cake
1 cup boiling water
2 squares unsweetened chocolate, cut up
2 cups sifted all-purpose flour
1 teaspoon baking soda
1/4 teaspoon salt
1/2 cup butter or regular margarine
1 3/4 cups light brown sugar, firmly packed
2 eggs
1 teaspoon vanilla extract
1/2 cup dairy sour cream
In a small bowl, pour boiling water over chocolate; let stand 20 minutes to cool. Meanwhile preheat oven to 325 degrees. Grease well and flour 9x5x3-inch loaf pan. Sift flour with soda and salt. In large bowl of electric mixer, let butter stand at room temperature until softened. At high speed, beat butter, brown sugar, eggs, and vanilla until light and fluffy. At low speed, beat in flour mixture (in fourths) alternately with sour cream (in thirds), beginning and ending with flour mixture. Beat in cooled chocolate mixture just until combined. Pour into prepared pan. Bake 60 to 70 minutes, until cake tester comes out clean. Cool in pan on wire rack 15 minutes. Transfer from pan to rack; cool completely. Sprinkle with confectioners sugar. Makes 1 loaf.