Section 308. Resolution and law are contracts with holders of bonds.
Except as otherwise provided in any resolution of the authority authorizing or awarding bonds, the terms of such resolution and any agreement authorized by such resolution and the terms of this act as in effect when such bonds were authorized shall constitute a contract between the authority and the obligees from time to time of the authority, subject to modification by the vote by holders of such percentage of bonds as the resolution authorizing or awarding such bonds shall provide.