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Stoich for E10 is closer to 14.1
The 360 mule I am testing with right now ,makes its best power and torque at 12.1-12.2 with 5 different carburetors I have been testing with. This is another non efficient combination though,8.8 to 1 compression aluminum heads,Comp Thumper cam.
How well the mixture is prepared can make a big difference. Part throttle tuning with different carburetors has been pretty revealing as far as rich/ lean conditions vs torque
Keith

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When I chassis dynoed my heap a few years ago max power was bet. 12.2-12.4 and that was w/Trick 110 leaded. I now run VP-100 unleaded and it`s at 12.8 and feels ok but I`m going to get it a bit fatter then check the plugs since I live/drive bet. 2500-4000 ft. depending on conditions and race way lower. This fuel in also apparently 10% so hopeing for a bit more power..........