In a small bowl, combine wafer crumbs and sugar; stir in butter. Press onto the bottom and up the sides of a lightly greased 11-in. fluted tart pan with removable bottom.
Place pan on a baking sheet. Bake at 350° until lightly browned, 8-10 minutes. Cool on a wire rack.
In a microwave, melt butter and chocolate; stir until smooth. Cool for 10 minutes. In a large bowl, beat the eggs, sugar, vanilla and salt until thickened, about 4 minutes. Blend in chocolate mixture. Stir in flour and mix well.
Pour into crust; spread evenly. Bake at 350° until a toothpick inserted in the center comes out clean, 25-30 minutes. Cool completely on a wire rack. Spread pie filling over the top.
In a microwave, melt chocolate and cream; stir until smooth. Cool for 5 minutes, stirring occasionally. Drizzle over tart. Chill until set.
Editor's Note: This tart is best served the day it is prepared.