440 Stealth Heads with Comp Cam Springs?

Take the gasket and lay it on the head's deck surface and see if the fire ring is sealing. I have not used them, but I believe you need to run Source's choice of gasket or the fire ring wont seal. Without that, you may have seapage issues. As far as the slot vs hole... I believe that is to slow the water downa little so it picks up more heat before it goes to the radiator. Nothing to worry about.