That stock is fine and does not need to be replaced. It can be repaired and refinished along with the rest of the job.

Definitely have G&H do the work, or failing that, choose a gunsmith of national reputation to preserve the value of the piece. If it's restored by G&H it will be as valuable as it can be when you get it back, although I would suggest that a restoration by someone like Monte Mandarino would be as prized, if not moreso.

I may have missed it, but how is the bore/chamber?