Sarg,
I wish that I had your problem. I'd dearly love to own that old girl and to make her shoot again. You've been given excellent advice here and I believe that fire lapping, re-crowning, a slight neck-ream if necessary, and larger diameter bullets, will have this grand old lady shooting very well. The stock is a very simple fix for anyone with a stock duplicator. Don't know how common they are in your part of the world though.