You can't just look at the coil as an isolated part. You need to look at the whole ignition system. It is the electronics box that determines if you can run the coil w/o a ballast resistor, not the coil itself.
If the electronic box has a built in current limiter, you can connect whatever low-resistance/high current/high performance coil to your box.
Go with a box+coil intended to be used w/o a ballast resistor. Example Pertronix Ignitor 2 & 3 plus the corresponding high performance coils. I'm sure MSD has something similar.


Martin, 67 Charger, 512 cui, E85, MegaSquirt MS3X sequential ignition & injection