Section 2. The purchase price of fair market value shall be paid in full to the Commonwealth over a maximum period of three years and may be paid in equal annual installments. If paid in annual installments, the first payment shall be due on July 15 of the year following the effective date of this act, and each succeeding payment shall be due on July 15 of the year in which it is due. The deed of conveyance shall contain a clause that the lands conveyed shall be used for burial ground purposes and if at any time the said Salem Evangelical Church or its successor in function conveys said property or permits said property to be used for any purpose other than that aforementioned, the title thereto shall immediately revert to and revest in the Commonwealth of Pennsylvania.