Nothing contained in this act shall be construed to extend the periods for the bringing of an action or for the doing of any other required act under any existing statutes of limitation nor to affect the operation of any existing acts governing the effect of the recording or of the failure to record any instruments affecting land nor to affect the operation of Act No. 216 of the Public Acts of 1929 nor of Act No. 58 of the Public Acts of 1917 as amended by Act No. 105 of the Public Acts of 1939.