I just contacted MSD in reference to your 6A system and one of their techs said to run at .10 higher but no more than .15 or less than .05. Touch and Feel. It all depends on mods. With mine he said to run .10
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66 Mustang Black W/ Black
289 Hi-Po 65'heads, MSD
Lunati High lift Cam
750CFM Carb Heddman Headers, Hurst Shifter
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