I lvled 4 undead locks and 1 shadow priest to 70 locks are 41 aff and 20 demo. priest is all shadow and some disc. I used 3-4 voids in instances. was able to clear normal instances with out problems. did most of lvling in instances. (was before 2.3) this was on pvp server. it took about 17 days played but all professions where at 350 plus. Rep was at revered or higher for all factions (instanance lvling) I then made all mount gold by doing quests at 70. Gold is much better than exp.

Anyways worked for me