Yikes, I completely forgot you had that! Now, what is under the distributor cap? A magnetic pickup? Do you know if it even works? Does it work with the 6 volt resistor wire or was that removed and replaced with a 12 volt wire? Some points replacement systems used the 6 volt wire or a separate ceramic resistor. Some used 12 volts. Try bench testing it. I do that all the time to test MSD boxes. Mount the distributor in a bench vise. Wire it up with a battery as if it was in the car. Spin the shaft by hand and see if it makes spark. Be sure to ground the battery to the vise and then the spark wire can fire at that. Don't get bit! If it does work I guess keep it. If not any GM HEI from 1975 to 1981 for a Pontiac or Oldsmobile will work just fine. We used to grab them from junkyard cars but those can be scarce nowadays. The GM HEI spark plug wires are good but there are many aftermarket upgrades available.
