I have a question about A/F readings and a cam

340 six pack. 11.3 to 11.5 at idle. Cam 550 solid lifter. 13 to 13.5 at 3000 to 3500 rpm. Full wot 10.5. First off I have to run 10% ethonal gas. So your afr has to be richened up to at least 13 to 13.5. Idle is at 900 rpms. Aem afr gauges in both sides. So does cam have affect on afr. Absolutely on tuning the carb.