Congrats on your new rifle! A good find and its future looks bright as Ophelia. I'd keep that stock if possible, adding some crossbolts and bedding for strenth and stability. And I think a 23" barrel would look nice and suit your intentions. And overall weight ready to hunt should come in around 9.5 to about 10 lbs - because with experience you may want to shoot some of those heavyweights at worthwhile speeds.
I'm sure others will chime in with more detailed suggestions and/or advice.
