(2) In the case of a plan which has a plan year which begins before January 1, 1975, and ends after December 31, 1974, the Secretary may postpone by regulation the effective date of the repeal of any provision of the Welfare and Pension Plans Disclosure Act (and of any amendment made by
subsection (a)(2) of this section) and the effective date of any provision of this part, until the beginning of the first plan year of such plan which begins after January 1, 1975.