Leaking Anti-freeze

I have a 1998 Ford Taurus Sho that has started to leak anti-freeze from the lower intake manifold. I recently has the short block replaced and all new gaskets put in, the heads where also sent out to be machined and cleaned. I have replaced the gaskets and it is still leaking from the same spot. I have even tried replacing the gaskets and using hi-temp gasket maker to make a secure seal and it still leaks from the same spot. I am going to send the lower intake manifold out to be machined and cleaned and replace the gaskets again and see if that works. Has anyone every had this problem or know how to fix it?

Seems like having them block and heads checked for flatness is a good idea. Did you follow the proper torque sequence when putting everything together?

-Rod