The provisions of subsection (a) shall not affect any proceedings, including notices of proposed rulemaking, pending before the administering authority or the International Trade Commission on the effective date of this title with respect to such section 303 [
19 U.S.C. 1303]. Orders shall be issued in such proceedings, appeals shall be taken therefrom, and payments shall be made pursuant to such orders, in accordance with such section 303 as in effect on the day before the effective date of this title and, except as provided in paragraph (3), shall be subject to review under section 751 of the Tariff Act of 1930 [
19 U.S.C. 1675] and, to the extent applicable, investigation under section 753 of such Act [
19 U.S.C. 1675b]. Orders issued in any such proceedings shall continue in effect until modified, terminated, superseded, set aside, or revoked in accordance with law by the administering authority, a court of competent jurisdiction, or by operation of law. Nothing in this section shall be deemed to prohibit the discontinuance or modification of any such proceeding under the same terms and conditions and to the same extent that such proceeding could have been discontinued or modified if this section had not been enacted.