No tsk
I have ran my 800 HP bracket motor on E85 since 2013, it does not like cold plugs at all whiney I would start with a retracted gap NGK-6 (sorry for not knowing that part # blush) and then maybe try a -7 later to see what your motor likes.
I use Autolite race plugs, part # 3934 up 3/4 inch reach, 5/8 plug size with a retracted gap scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)