Fuel Bowl, Holley 1-bbl

Hello all, I must be doing something wrong, but I keep changing gaskets on the fuel bowl on the Holley 1-bbl carb. Am I doing something wrong? I keep having to buy carb rebuild kits just to get the fuel bowl gasket. How tight do those screws need to me? I change it, and a few days later, it is seeping out slowly, onto the intake manifold. Thanks for any tips,