Prophylactic cyanoacrylate impregnation or glasbedding is quite different than repairing existing cracks in the head of the stock.
No stock specialist can know what needs to be done until the gun is disassembled.

Craig Libhart in Bainbridge, PA and you might ask him
Susquehanna Stockworks
717-367-3414
http://susquehannastockworks.com/about.htm