I've inspected the Holley 4160 closely on car. The fuel levels are set correctly. No leaks from the bowls or the bowl screws. Nothing from the accelerator pump or fuel line. I thought perhaps the throttle shaft but it appears to sit below where the fuel is most obvious. The leak will dampen the carb-to-manifold gasket a bit at all four corners. Any suggestions?

BTW, while I've rebuilt the carb several times, I've never replaced the throttle body gasket.

JamesC