Can't get these damn headers to stop leaking COOLANT!!

I'm so pissed off at this point, I am about ready to take these damn tti headers off and install manifolds with studs in the head. I have tried everything I can think of to try and seal these damn things up but it's not happenin. What do you guys recommend to put on the header bolts to keep them from pissing coolant? I have tried liquid teflon "didn't work at all" and black silicone "works better but still sucks". It's a 440 by the way. HELP PLEASE!