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At 395 cu in & therefore 810cc per cyl I would suggest that '70' idle jets might be a better choice. sounds like there is a slight lean spot at light throttle cruise conditions @ those RPM where the carbs are probably at the top end of the transition point from idle to main circuits. As the F16 is richer than the F7 you replaced its unlikely that this is the cause.
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Jac Mac
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