The provisions of 73 O.S.1961, §§ 151 through 153, inclusive, and §§ 155 through 166, inclusive, insofar as the same are not in conflict herewith, shall apply to and govern the proceedings under this act, and the execution of the authorization herein contained. All mandates, authorizations and conditions therein prescribed shall be applicable to this act. Provided, however, that nothing herein or in such sections to the contrary notwithstanding, the State Treasurer may not and shall not purchase the bonds issued hereunder.