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with the M&W igniter module, i would run a 2 channel with GM DIS coils. i have a sneaking suspishion (spelled wrong because the language filters here are effing retarded)- based on the charge current clamp and operating temp range- that the M&W igniter just uses the bosch BIP373 ignition IGBT for each channel, so you could easily build something comparable for much much less than the price of the M&W. the bosch IGBTs are pretty indestructable. i think diyautotune.com sells em for like $8 ea, and they really only need a resistor on the gate for the ECU to drive them.
the GM coils don't need much dwell at all. ideally, you'd want to be able to ramp the dwell time with load, so you're really only pushing the coils when you need serious spark. i believe they work well with cranking dwell around 3mS, and running dwell at 1.5-2mS. if you have an extra channel to datalog, put a 0.1ohm resistor inline between the igniter and ground and log voltage drop across it. every 100mV=1A. 7.5-8A is more than enough current at full load.
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