What spark plugs are you guys running in your 408 strokers?

Thanks Brian T that is exactly what I was asking which plug everyone was using currently I'm using what the head manufacture is recommending which is the Champion RC12YC now the next question is what are you gapping the plugs at? I know that I have been gapping them at 37 which is what the service manual says so do you set the gap different for the 408?
Pat Faley