change all lights incl dash, alt or gen to a 12v, voltage reg. for the starter I know that guys have left 6v ones in and have them work for years, it will spin much faster and as long as your motor is healthy and you don't have to crank it for 30 sec + every time to start, i'd leave it until next time you have the motor out and then switch the flywheel and starter bushing and oh yeah clearance the bellhousing