1968 Dodge Dart GT Sleeping Beauty?

what year is your engine? if it is 69 or older and you try to use the drivers side timing mark it will not be correct. The 69 and older damper is set up for pass side timing marks and the drivers side timing mark is NOT 90 deg different, so you can not just use a different cylinder. You ill need to create a new TDC mark on the damper. NOW if the engine is 70 up and you have a 70 up damper your fine!