Thank you Dave. I was about to estimate 20A. In any case, there are a lot of assumptions going on here. If someone wants to risk the price of an "orange box" far be it from me to stand in their way.
The current would be close to 20A if a modern IGBT is used. The MJ10012 is a Darlington, the second transistor in the configuration results in high gain to reduce the base current, but places a diode drop in the overall collector to emitter drop.
There are other problems, the 8mH inductance is large, resulting in greater spark energy. Exceeding the current, followed by a huge voltage, most likely will result in certain death to transistor. There is also power dissipation problem, because the heat sink is way too small.
What would likely survive is a heat sinked HEI module. The internal dwell control and current limit, controls the peak current to safe levels.
But...the blaster 3 is a miss match for an inductive ignition application.