I recently finished restoring an F-14. It was one of the earlier production ones and the roms in the machine are labeled Proto4. I've tried to find some information on these but haven't had much luck and don't have another F-14 nearby to compare the difference with the final version. The biggest thing i noticed is their is no way to turn flight insurance on from the kicker. my question to the group is it worth upgrading and if do upgrade should i replace the sound and voice roms too?