What coil..?

Exactly. All you need is enough voltage to break down the fuel-air mixture in the gap and start an arc, with enough stored energy to maintain that arc hot enough for long enough.....but more volts looks good. Canister coils of the typical size are physically limited to how much voltage you can get out and how much magnetic field energy you can store. They are not really all that different versus what they were in 1960.... That is why I'll just get a reliable canister coil for a standard points or ECU systems and leave it at that.

You need to change the coil/coil size and configuration and how the coil charging is managed (CD, MSD, HEI) to move beyond that.