I'm up to the final dungeon, though I can't remember what it was called, I'm playing the NES version. Right now my party members are all level 40, their Jobs being Knight, Dark Knight, Summoner and Shaman. I still don't have Leviathan and Bahamut, though I'm contemplating going back for them.
What level should I be before I try and finish the game? I once got a lot closer to the end on a really old save on a really old PC I no longer have, and royally sucked against the four Dark Crystal guardians (each of them usually killed me in two turns).
I realise there's a thread almost identical to mine (right down to the poster's party's levels), but it's for the DS version which I believe is radically different.