Fuel Bowl, Holley 1-bbl

I would check both the face of the fuel bowl cap and the face of the carb where the bowl mounts to make sure they are flat, and with no nicks or dings that could leak. Use a straightedge to check the flatness of the surfaces - a small piece of glass works well too, as glass is amazingly flat. The screws need only be nicely hand tightened with a screwdriver - you don't have to crank them down hard. And if you are even reasonably handy, you can avoid buying a complete kit just to get the bowl gasket by making your own. Any parts store has gasket stock, just lay the old gasket on there and trace around it. Cut it out with a razor knife and you're set.