Per Joe above, think long and hard before you recase.

If your decision is to recase, contact one of the guru guys who does it for a living and discuss; John Gillete comes to mind. It will almost for sure be annealed prior to being recased. I'm of the opinion that annealing is superfulus as the case soak temperature is well above critical (the temperature at which the steel goes dead soft - cooling slowly keeps it soft; annealing). However, it is known that annealing works with warpage being rare. I can't see any downside to annealing first and I mean no criticism of current practice in re-case hardening.