German chocolate "pig out"

1 pk German chocolate cake mix
    2/3 c  Evaporated milk
    3/4 c  margarine; melted
     16 oz Bag caramels
      1 c  Pecans; chopped
      8 oz chocolate chips
 
  Combine cake mix, 1/3 cup evaporated milk and melted
  margarine. Spread half of mixture in bottom of 9 x 13"
  cake pan. Bake 5 minutes at 350~F. Heat the caramels
  and 1/3 cup evaporated milk until melted. On the baked
  layer, spread the pecans and chocolate chips and the
  melted caramels and milk mixture. Top with the other
  half of cake batter. Bake 20 minutes at 350~F.