RN12YC, is, IIRC, the Edelbrock-recommended plug for my alloy heads.
If I told you that I installed them at .045, in my 367, in 1999, would you believe me?
How about if I said they currently have over 100,000 miles on them?
I use a big Yellow Square-top Accell SuperCoil. In a pinch, I think you could weld with it. lol. I have not looked at the plugs since winter of 2004/05.
