I've been trying to wrap my head around the 'how' and 'why' of advance. The article in the link below really helped me and I thought I'd share it around. Written by a corvette guy but the theory is universal.
http://www.corvette-restoration.com/resources/technical_papers/Timing101.pdf
good read. can you post the next "mapping" article link?
This looks like it. Not on the corvette site but it fits.
http://www.lbfun.com/warehouse/tech_info/timing%20&%20vacuum%20advance/MAPPING%20ADVANCE.pdf
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