keep it stock if its a daily highway cruiser. if you drive in town all the time, 4.11s or 4.30s. 4.56's is too low for that size tire IMO.
I run 38's and 4.30s, alot of people run 37's and 4.30s, some run 4.11's with 37s, but they usually have 400hp+. changing the gears is not cheap either, so keep that in mind.