Can you open the crack a bit by flexing the stock? How deep does the crack go with the action removed?
If it is a deep crack, more than 1/2" down from the surface drill out from the inside of the stock from the back of the action towards the wrist and use a threaded screw with acraglas or similiar viscosity epoxy to repair it. If it is not a deep crack get is as open as possible and allow the araglas to penetrate as deep as possible and allow to cure. Wipe an excess acraglas before it sets and you should have a repaired crack that is almost invisible with no refinishing required.
+1 the soft brass screws borwnelles sell are ideal and designed just for this. I've evey used them as crossbolts. you could get 'em delivered in 2 days, 15 min fix, 2days dry.
