Ignition box dead?

I attempted to drive my Duster today in 3*F (yes three degrees) weather, I actually got it started with no troubles and drove it for a while. Then I went to make a turn, accelerated onto a main road and it just died when I let off the throttle. Thought the battery was bad (which it was) but that didn't fix it; just cranks with no spark.

I have a Mallory HyFire 6A ignition box hooked up to a newer factory electronic distributor. I installed it about seven years ago under the hood just on top of the pass. side inner fender and I'm guessing the extreme temps got to it after all that time. Is there a good way to check the box itself and then the coil maybe as well?