Not Ranked
Any slop that's in the timing mechanism is always there. It's included in base timing. Therefore, nothing to worry about, or compensate for. Although an interesting tidbit of info, not a whole lot of practical application. Set base timing at 10*, mechanical at 24*, and advance base timing as needed. Most of the time, there's no advantage to more than 36*.
MSD says they don't make a bushing to get less than 18* of mechanical advance. Where did you get yours? Did you make it yourself?
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