Some of those old, fine, SXS shotguns should not be restored. If you can fix the stock or replace it, then go ahead.
The barrels may not be so lucky. If Damascus, it is not safe to shoot or try to repair.
Make it look good and put it on display some where.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)