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The wideband is just a tool, and with out knowing what the A/F should be it is a useless tool. Many article state that A/F ratio should be between 14.7 to 12.5 but I have noticed that the poping thru the carb happens at 14.7 and 15.0.
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14.7:1 -15.0:1 is very lean and will cause popping out of the carbs. Look at some of the dyno charts that are here and on other sites. They will often indicate the A/F ratios at respective RPMS. You are on the right track aiming for 13.8:1.