What plug to use with nitrous, on a 451 stroker

I have a 451 stroker running 11.5 to 1 compression with iron heads and would like to know what plug to run for my nitrous set up. I run a big shot set up and run a 275 horse shot. I know they say you need to run a colder plug and a none protruding plug. Can any one tell me what they are running in a similer situation.
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