"I have an E M Reilly boxlock in fairly sad shape and am unsure if it is worthy of restoration."

You need to decide on what "worth of restoration" means.
If your restoring to like "NEW", or just getting the gun back to respectable shooting condition. Myself i wouldn't want it LIKE NEW. If your looking for a shooter, i think you can restore it for much less. Especally if you can do some of the work yourself. Plus thats the biggest part of all the fun in projects. Can't you live without a restock?