1974 duster 440 wont start HELP

I would check the pick up coil first-unplug the two pin plug/wire coming from the distributor and ohm them out (check for continuity ) you should get a few hundred ohms reading. If it checks ok plug it back together. now check the gap (see the warning about no magnetic feeler gages). Some one help me I do not remember the gap reading but it should be close but not touching.