All Small Six AFR at idle: how lean is too lean?

This relates to all small sixes

clochard68

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My 200 small log engine survived the cam break in (what a nerve wrecking procedure that was!), and this weekend I plan on tuning my Weber 32/36 with my AFR-gauge to go for the first test drive.
I recently saw this David Vizard video, where he talks about setting your idle up for minimum fuel consumption (starts at around 25:00):


He talks about air-fuel-ratios at around 15:1 at idle...
Has anyone done his method before? (air/fuel mixture for MINIMUM vacuum, then adjusting timing for MAXIMUM vacuum --> results in lean mixture with high timing)
Any thoughts on that method?
 
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