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Just fired up for the 427 first time in the car. When the ignition switch is turned off it keeps running, had to pull the coil wire. Never had this problem before I replaced everything under the hood and bumper to bumper. I don't think it's the ignition switch. Am running 6al with billet dizzy.
 

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Yes you have to put a diode on one of the wires from the alternator. With the motor running and alternator turning it is keeping power to your MSD box and will not let the motor turn off. Do like Jim said and go to MSD.COM. They have a troubleshooting forum on their website.
 

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Sounds like your switch 12v wire (small red wire I believe) is hooked to B+ instead of IGN. However the big read wire should be connected to a fused B+ source.
 
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