Except as provided in subsection (b), there are hereby authorized to be appropriated such sums as may be necessary and appropriate for the carrying out of the provisions and purposes of this Act [sections
2061 to
2171 of this Appendix] (including sections
302 and
303 [sections
2092 and
2093 of this Appendix], but excluding sections
305 and
306 [sections
2095 and
2096 of this Appendix]) by the President and such agencies as he may designate or create. Funds made available pursuant to this paragraph for the purposes of this Act [said sections] may be allocated or transferred for any of the purposes of this Act [said sections], with the approval of the Office of Management and Budget, to any agency designated to assist in carrying out this Act [said sections]. Funds so allocated or transferred shall remain available for such period as may be specified in the Acts making such funds available.