The various school districts which may become parties to any such agreement are authorized to appropriate and expend for the purposes thereof any and all funds which may be required to carry out the terms of any such agreement from any funds available to any such party to such an agreement not otherwise appropriated without limitation as to the source of such funds, including minimum foundation program funds, sixteenth section funds, funds received from the federal government or other sources by way of grant, donation or otherwise, and funds which may be available to any such party through the State Department of Education or any other agency of the state, regardless of the party to such agreement designated thereby to be primarily responsible for the construction or operation of any such regional high school center and regardless of the limitation on the expenditure of any such funds imposed by any other statute. However, no such funds whose use was originally limited to the construction of capital improvements shall be utilized for the purpose of defraying the administrative or operating costs of any such center. Any one or more of the parties to such an agreement may be designated as the fiscal agent or contracting party in carrying out any of the purposes of such agreement, and any and all funds authorized to be spent therefor by any of the said parties may be paid over to the fiscal agent or contracting party for disbursement by such fiscal agent or contracting party. Such disbursements shall be made and contracted for under the laws and regulations applicable to such fiscal or disbursing agent. All of the school district parties to any such agreement may issue bonds, negotiable notes or other evidences of indebtedness for the purpose of providing funds for the acquisition of land and for the construction of buildings and permanent improvements under the terms of any such agreement under any existing laws authorizing the issuance or sale thereof to provide funds for any capital improvement.