Nope can't say it is the coil yet.

You can check the cap and rotor next, and just for kiss, make sure the rotor spins when trying to start the car. Have heard of that, but not seen it. The cap and rotor would only stop or inhibit some firing. Like a miss. Unless it was cracked or the top was missing, you should still get spark.
You can check for spark at the coil to be sure.
Pull the coil wire instead of a plug wire.

Next up look at the points themselves. Make sure they are opening and closing and the ends are not gone. Though honestly the petronix conversion is so simple, it really took me 15 min to do, I would do that. But if you are stuck on trouble shooting points thats fine.

If the points are not burned away, and are opening and closing, and the distributer is turning, then I would try replacing the coil first.