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My preference for your setup would be .040, but anything between .035 and .050 is good.
Smaller gap = less chance of misfire due to some part in the ignition system not being totally up to snuff.
For dyno runs and high power operation, there is so much mixture motion there's really no benefit with a wider gap. Wide gaps are good for fuel mileage at low MAP/low RPM conditions.
 
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