Is it worth tuning a carb with an air fuel ratio gauge? I have headers with the O2 bungs welded in. I was thinking about buying the O2 sensors and an AFR gauge. However, my cam, in a sbc 350, has a lot of overlap 227 @50 .565 lift on a 108 LSA. It is my understanding that a fair amount of unburnt fuel is pulled into the exhaust valve and passes out the exhaust. With more overlap can you get an accurate reading on an air fuel meter or gauge? My concern is it will read rich when it is not. Other option is simply read the plugs and be done with it. Thanks for the help.