What Is To Ring A Cylinder Head???
Depending on how much boost you will be running MLS (Multi Layer Steel) headgaskets will work just fine and you won't need to "o" ring the heads or block. I am running MLS on my 340 with 270 psi cranking pressure (14:1). Been in the motor 2 1/2 years with no blown gaskets yet. I am also running studs.
Chuck