Holley 4777 carb shaft leaking fuel

You should not have fuel coming out the throttle shaft... there should be enough Gap at idle.between the throttle blade and the bores for the fuel to make it through there. you would have to have an awful lot of fuel to make it through the throttle shaft and even then I don't think it would even go through the throttle shaft... but that is based on because I have never seen fuel come out the throttle shaft that didn't have a wasted bushing to begin with.
You might want to check your floats setting.

To know for sure if the throttle bushings/teflon are shot... run it at idle and spray some water or wd40 on the shaft ends at the base/throttle plate. If the idle drops... they're leaking.