I have not tried modifying the stock on the Mark II, but I have on pretty much every other rifle that I own. Go figure. Anyway, the stock is very weak like Val said. Savage sells replacement wood ones if I remember right. Looked at getting one at one point.
The rifle is a serious shooter. I couldn't believe how accurate mine was. Was just looking for a training rifle because components are so expensive for reloading.
Anyway, there is also a shimming trick that you can do to the trigger group if you are competent and confident of your abilities. I can pm the link to you if interested.
Otherwise, junk the stock. It isn't worth the time to try to fix it. That isn't what you want to hear, but how much is your time worth?