Points systems used a ballast resister or resistance wire to drop the ign. voltage to keep the points from burning up. The first thing I did when I converted to electronic was to check with the manufactures to know who needed 12 volts and who needed 9 volts. Malory Unilite requires only 9 volts to its distributor, whereas MSD required a full 12 volts. If you took your ignition system out of a car with a 12 volt feed and didn't rewire yours that's a definate problem. You're going to have to run a new 12 volt feed from a switched source. As a test you can run a jumper lead right from the battery with a toggle switch to turn on/off to the distributor and disconnect the factory lead momentarily. You'll have to open the hood to turn switch on and off when starting or shutting off car but it will tell you if that's your problem.
BUILT FORD TOUGH