The deductions allowed by sections
243 (relating to dividends received by corporations), 244 (relating to dividends received on certain preferred stock of public utilities), and 245 (relating to dividends received from certain foreign corporations) shall be computed without regard to section
246
(b) (relating to limitation on aggregate amount of deductions); and the deduction allowed by section
247 (relating to dividends paid on certain preferred stock of public utilities) shall be computed without regard to subsection (a)(1)(B) of such section.