It's always a good idea to get advice from this board, then go ahead and experiment with your own ideas. There's always some bad advice (Mopar Myths) though. I've been ranting about ballast resistors for years. But, I believe in the "Scientific Method".

My experimental results :

I run a chrome box with a .25 ohm resistor , and a MSD Blaster 2 coil. Nary a problem. I have run the .25 resistor with an orange box with no problems , either.

The fact is, the parts houses sell these crap 1.5 ohm resistors ( and maybe 1 ohm, I don't recall). Want to be less than optimal, then run those. Granny loves them.

My Mopar ECU is mounted on a standoff. No melting of the potting material. I have been informed that steel is not a good conductor, but the air flow behind my standoff appears to help.

During the heat of a race ? Think about it - those high values will retain heat and resistance , and deliver less current to the coil.