Attempt to get the FATTEST spark plug arc

Not sure where you got the 1 amp per 1000 RPM. There isn’t a battery fired ignition I know of that gains power with RPM.

And I don’t think the old MSD 10 boxes made an amp.

If you want amperage (don’t we all) then you need to get a magneto. Not the Vertex style with the internal coil, but the Mallory with the external coil. You can send those out and get 5 amps easy. 5 actual amps, not the MSD wonky method of measurement.

I personally wouldn’t use a 6 box on anything but a dead stocker.

Wait for the guys to chime in who run 5 second 1/4’s with and analog MSD 6.

The 7 is the MINIMUM box any performance engine should use.

As a very smart dude once said, “you can’t have too big of a fuel pump, push rod or ignition”.

I agree with that 100%.