Not later than 60 days after July 22, 1987, the Secretary shall by notice establish such requirements as may be necessary to carry out the provisions of this part. Such requirements shall be subject to section
553 of title
5. The Secretary shall issue requirements based on the initial notice before the expiration of the 12-month period following July 22, 1987. Prior to the issuance of such requirements in final form, the requirements established by the Secretary implementing the provisions of the emergency shelter grants program under the provisions made effective by section 101(g) of Public Law 99–500 or Public Law 99–591 shall govern the emergency shelter grants program under this part.