When it is running what is the voltage at the + side of the coil. It should be 9 volts or so if you are using a resistor or resistor wire. If the voltage is less than battery voltage when it is not running it should be less when running as well as the feed is the same. If it isn't you may have the alternator back feeding it some how.
Do you have a dwell meter. Unless you are real experienced with setting the points with a feeler gauge it is hard to get them set properly. Dwell should be 28-32*.
Also keep in mind that changing point gap also affects timing.
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