All existing ordinances and resolutions and all existing administrative rules, regulations and practices, if not inconsistent or in conflict with this Charter, shall continue in full force and effect until repeal or modified by Council or other competent authority of the City. All ordinances, resolutions, rules, regulations and practices that are inconsistent or in conflict with this Charter shall, unless sooner repealed or modified, continue in full force and effect for a period of 60 days and at the end of that period shall, to the extent of such inconsistency or conflict, be of no further force or effect.