I am running the NGK FR5 plug gapped at .032 in the combo below.
My car runs hot too for E85 but it is because my tune was set ultra conservative, so much so, that it runs hot from a LACK of timing.
What kind of timing are you running.
Dart 348ci, Ed Curtis cam/valvetrain, Precision 76mm, Holley Dominator EFI, CNP ignition, tons of Holler EFI small parts, 4"dp, 4R70W w/T-brake, new suspension coming soon.
Little 750rwhp at 6,000rpms and only 10lbs of boost before we just got tired of playing with clutches. New 4R70W and we are turning it up. Expecting 1,000rwhp.