Mix and bake cake according to package directions, using 2 90in. cake
 pans.  Cool in pasn for 15 minutes; remove from pans and cool
 completely on a wire rack.  In a mixing bowl, beat cream cheese,
 sugar, vanilla and salt until fluffy.  Foldi ncream.  Splite each cake
 into two horizontal layers; place one on a serving plate.  Spread with
 a fourth of the cream mixture.  Sprinkle with a fourth of the
 chocolate.  Repeat layers.  Cover and refrigerate 8 hours or
 overnight.