1In a large bowl combine the cream cheese and 1 cup of the powdered sugar, mixing until well blended.
Stir in pumpkin, spices and grated orange rind.
In another bowl, beat cream until stiff peaks form; gradually add remaining powdered sugar, beating stiff. Fold into pumpkin mixture.
Split pound cake horizontally into 3 layers. Spread each layer with some of the pumpkin mixture, then stack. Frost sides with pumpkin mixture. Sprinkle orange slivers on top and refrigerate at least one hour before slicing to serve.