Best coil, box , resister combo ?

Well I've been trouble shooting guys. I got the revenator box msd coil and the supplied .8ohm resister. I changed one part at a time. The rev box was working. Put the msd coil in and everything went south. The rev box couldn't get set. So Mancini is taking the revenator box back to exchange. I used the msd coil for target practice.
I have a new flame thrower coil. The old chrome box and the old .25 ohm resister. It's running awesome. But not traffic lol. I'm sure the box still needs replacing. Waiting for the revenator exchange and small resister. Will try again. Or back to current set up.
Big question. Why do I have to use the bigger .25 ohm resister with chrome box.

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