If it is off by 180, you need to lift the whole dist and turn the rotor 180 degrees and then reinstall the dist.
One way to check if it`s off is to put your thumb in #1 sparkplug hole while turning the engine over by hand to feel the compression build up. The next time the timing mark show up on the damper is when you `ve got the #1 cylinder in ignition position, and the rotor should point towards #1 ignition
wire. Check this before you remove the dist.
Sorry, to slow on typing.....67Dart273 is way to fast for me.. :)