OK, here is a view of metering block from an old Holley 780VS. If the fuel level was set to the bottom of the sight glass, then it would have been covering both e-bleeds. The only bleed not covered is the kill bleed. Does the kill bleed affect the AFR?

On my QF metering block even though the top e-bleed was not anywhere near covered with the second and third float level I tried, the carb still ran noticeably rich at highway speeds.

Next up, a comparison of the two metering blocks.