There aren't actually a lot of great job xp targets... job 67 is the most common level to be at when you first hit 99 trans, and those last 3 JLs can take quite a while. I'm not terribly worried about that though, as I'll just max my guild tax when I hit 99. (Guild taxes only affect base xp, so I should be able to get us a few guild levels for basically free.)
That being said, the necromancers for this quest ARE in fact, a good jxp target, at 45k base and 35k job. (You need over 300 mil for the final base level, but only over 200 mil for the final job, so that's relatively speaking, actually more job than bass.)
http://ro.amesani.org/db/monster-info/1870/