Help Choose new Plugs for worked 360

I run NGK 5155 in my bored and stroked 360 (408). My compression is 12:1 and I gap them at .050. I run NGK in almost every vehicle we get in the shop. I never have issues with them. I just changed mine a few weeks ago. They looked good but were two years old with 16,000 hard driven, race gas fueled miles.