(1) This part does not terminate or in any way modify any liability, civil or criminal, which is in existence on June 25, 1976.
  (2) For the purposes of determining any penalty or liability in respect to an act or omission occurring before June 25, 1976, former Act No. 297 of the Public Acts of 1949, and former Act No. 233 of the Public Acts of 1959 shall apply.