Plug selection 360 Magnum

What would be a better plug to run in a 300 hp crate 360 magnum. The NGK BKR5E or the NGK ZFR5F11's?
The ZFR5F11's have a longer electrode then the BKR5E, The BkR5E is the same exact length as the champion rc12yc's which was the factory plug in the 360 magnums for awhile.
I'm just wondering if running the longer ZFR5F11's would hurt anything since they are a little longer? They look like they would most likely run a little bit warmer then the bkr5e's too. I run 91 octane ethanol free fuel and I live 4000 feet above sea level. And my timing is 15 degrees initial and 33 degrees total. Which plug would you run out of these two?