In addition to sums heretofore expended for the acquisition of property and interests therein for the park, from funds available for expenditure from the Land and Water Conservation Fund, as established under the Land and Water Conservation Fund Act of 1965 [
16 U.S.C.
460l–4 et seq.], not more than a total of $8,700,000 may be expended for the acquisition of property and interests therein under sections
429b to
429b–5 of this title.