Engine Cutting Out! What to check?

I would agree with the Champion GR9s. Buddy runs them in his 14:1 340 with no issues. Not sure about a 15:1 motor, but I have the pertronix in my 11:1 340 and love it. The rev limiter is a little diff to get used to. It dont break down @ all it just stops revving. Mine is set for 7200 RPM. It will hit 7200 and just hold there, no breaking down like the MSD in my duster.