I don't have one of these Hellcats, but I know they're larger than my P-36, and I got it to fit under the .60 size cowl with minumum penetrations.
Also, I took off the extended breather for the carb, you don't need it and that way, you wont have the big tube sicking out of the cheek.
good luck with that!

here's teh link:
http://www.rcuniverse.com/forum/m_6177482/tm.htm