PLT-1
When you bypassed the ignition switch by providing direct power to the red wire of the msd circuit, did you try starting the motor? if it is the ignition switch power that's causing your problem, you should now be able to crank and start the motor. If you still cannot start it, then it could still be your distributor or box. To verify the distributor is good, you can bypass the msd box, since the 8350 is a ready to run. If it runs, then it's the box. If it doesn't then it's the distributor.
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