In all instances where authorizations of appropriations for the acquisition of lands for the National Park System enacted prior to January 9, 1971, do not include provisions therefor, there are authorized to be appropriated such additional sums as may be necessary to provide for moving costs, relocation benefits, and other expenses incurred pursuant to the applicable provisions of the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970 (Public Law 91–646; 84 Stat. 1894). There are also authorized to be appropriated not to exceed $8,400,000 in addition to those authorized in Public Law 92–272 (86 Stat. 120) to provide for such moving costs, relocation benefits, and other related expenses in connection with the acquisition of lands authorized by Public Law 92–272.