Head gasket woes

Fix your tune up. No way you failed TWO head gaskets at the same time in that short of time.

Edit: those gaskets should live forever at that compression ratio.

How much quench do you have? Where is your timing? What plugs and heat range?
Quench is non existent, as I’m running 308 castings with Ross -11cc I believe. Cylinder pressure is 180+ total timing 36*. I’m not versed in heat range. The plugs looked great. Any suggestions on plug heat range would be appreciated.