In a large bowl beat cream cheese, 3/4 cup butter and vanilla. Alternately beat in sugar and 1/4 cup milk. Stir in 4 squares melted chocolate. Save 3 1/2 cups mixture for frosting. Chill. Stir 2 squares melted chocolate into remaining mixture. Beat in 1/4 cup butter and the eggs. In medium bowl combine flour, soda and salt. Beat into chocolate mixture alternately with 1 1/4 cups milk. Turn into 2 greased and floured heart shaped pans or 9" x 1 1/2" round cake pans. Bake at 350ºF. for 30 to 35 minutes. Cool in pans 10 minutes. Remove; cool on wire racks. Let frosting stand at room temperature about 15 minutes. (If necessary stir in 1 to 2 teaspoons milk.) Frost cake and cool.