I had the same problem intermittently in my Charger. Months would go by where it would be fine, then it would do the following: Crank, crank with no fire, then just as I release the key, it would snort and the engine would spin backwards a little as if it were ready to backfire. The wiring was original but in good condition.
I have a MP electronic ignition conversion in the car. I tried swapping spark boxes, coils, ballast resistors...It turned out to be in the distributor. The reluctor wheel had clocked out of phase. I repositioned it and replaced the magnetic pickup and have not had it happen again. This was almost 5 years ago.