Though I am not sure, I would have the steel of the action tested for hardness by a qualified person. The heat treating process it underwent at the factory was most likely un-done by the house fire. It may have to be re heat treated before it is safe to fire. As for the stock, I would just leave the color as is and Tru-Oil it. The darker burned areas add a lot of character to the rifle and help prove it's story. Also, I personally thank you for restoring an older, quality bolt action .22. These guns are often forgotten about, but they are also often much higher quality than "new" production, popular rifles.