Copper Gaskets

Has anyone here have some insight with the copper gaskets? I'm planning on running boost to my 67 225, maybe about 5-8psi. I've heard the copper gasket is the way to go using boost. But I recently had something brought to my attention about using the copper gasket. O-rings and reviever grooves. I'm assuming the o-rings would be steel and the reviever grooves would have to be machined in the head or deck? Does any one here have experienced information on this?