Steve Magnante at BluePrint Engines any Q and A??

Ya know me Johnny a total simpleton on engines but I have a question on octane in fuel and what is the best to run in my 408.
I know 91 is the lowest but do I have to reset my timing if I run any higher than say 93 octane? and is there any benefit running higher octane?
Also I don't use ethanol fuel but is there any advantage to using it?