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MSD loads up their distributors with their most conservative advance curve. In a lightweight Cobra you can run a much more aggressive advance curve. If you speed up your advance curve (a factory Ford 427 distributor was all in at 2,400 RPM) and run more base timing at idle, your engine will run a lot better (throttle response, lower under hood temperatures, etc). I have been very happy with running the most aggressive advance curve.
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