The traditional pronunciation has the accent on the second syllable, "ju-STI-shee-ar", but I'd probably be fine with scootching the accent back to the first, to match with the modern pronunciation of "justice" -- "JUS-ti-shar". At least it sounds better than just-a-car. (It's reinterpreting the IA as a diphthong vowel instead of a syllabic break, but that's okay.)