carburator leak ???

[sphooch]

Hi, guys , i'm working on rebuilding a Zenith 2 carb. its leaking but I don't know why. carb. has been sand blasted , thoroughly cleaned, all the jets were cleaned using a welders tip set, new gaskets installed, I set the float and it stops the gas from coming in as you can see in the pictures. the carb. only leaks when I put the bottom half together, and then from the weep hole at the choke . so I changed the comp. jet but no difference. then I stopped to ask advise. any ideas you can suggest?.