Every contract entered into by the board for the use of any project or part thereof, acquired, constructed or completed from the proceeds of the sale of revenue bonds shall incorporate by reference the provisions of any indenture pursuant to which the bonds were issued. Every such contract or lease shall also refer to the provisions of such indenture with respect to the obligation of the board to fix rental fees and charges to meet the payments provided for in such indenture and in the proceedings for the issuance of revenue bonds and all payments required to be made to the board under such contract or lease shall be subject to increase if and when the board is required by such indenture to increase rates or charges to meet its obligations under such indenture providing for the issuance of bonds.