if you are staying N/A and want to go E85, the only thing you need are injectors, most popular being GTR injectors. If going boost you'll need a bigger pump.
Uprev will allow you to switch between E85 and 93/91 but you'll have to empty the tank as much as possible. If you are on Ecutek, you need the ethanol sensor and slight rerouting of the fuel line. Specialtyz has a kit for N/A folks going flex fuel.
https://www.specialtyz.com/370z-g37/...-fuel-kit.html