Preheat regular, conventional oven to 350°.
Beat sugar, butter & vanilla in large bowl.
Beat in eggs.
Mix in cake flour, baking cocoa, soda, salt, chocolate pudding and buttermilk.
Stir in semi-sweet chocolate chips.
Pour into greased tube pan.
Bake in regular, conventional oven at 350° for 30 minutes.
Adjust baking temperature down to 325° and continue baking 30-40 minutes more, until cake tester comes out clean.
(Check with cake tester at the one hour mark.)
Cool cake completely before icing.