Depends on how easily you can Leeroy the instances and how well you know the quests like Littleburst suggested.

I would setup a XP per hour addon (xptolevel) and the instancetimer addon. The first few times you might be slow and xptolevel needs a run or two to get its head straight. Some instances have synthetic barriers that don't allow crazy pulling and you have to man handle pull after pull or can only pull a single room at a time.

But once you learn to pull the what you can and the LoS the room to get casters bunched on your you can really start moving, and frankly its sort of fun.

Utgarde Pinnacle, Gundrak can be be pulled pretty much one pull per boss. Old kingdom seems like it could work, but your slaves are dead too quick from aggro dumps oddness.

Seems odd, but I would give some thought to just how fast you can do the TBC instances, Heroic Shattered halls, Mana Tombs and Shadow labs have a crazy number of mobs, which depending how deadly your booster might be worth it. Until 72 or something. Plus the stuff hits for nothing.