Preheat oven to 350 degrees.
Mix wafer crumbs and margarine.
Press in ungreased 9 x 9 inch square pan.
Bake 10 minutes.
Heat whipping cream and 1 c chocolate chips over low heat, stirring frequently, until chocolate is melted; remove from heat.
Cool about 5 minutes.
Beat eggs, sugar and salt in large bowl until foamy.
Pour chocolate mixture into egg mixture, stirring constantly.
Pour over baked layer in pan.
Bake 25 to 35 minutes or until center springs back when touched lightly.
Cool 15 minutes.
Heat 1/2 c chocolate chips and 1 T shortening over low heat, stirring frequently, until melted.
Spread onto bars.
Refrigerate uncovered about 2 hours or until chilled.
Refrigerate any remaining bars.