Don't scrape it!
Start with a toothbrush or similar and scrub it using mineral spirits or ethanol or even acetone (which may dissolve the brush eventually).
Then find a clear plastic box - like a Walmart storage box. Put the stock in it, and set it in direct warm sunlight. Try to get the temperature up to 110-120F or so. Once it has been good and warm for a while see if it is starting to sweat oil, especially on the inletting surfaces. You can also try to warm it in an oven or even a microwave, but it is easy to over do the heat issue and create cracks.
If it will sweat oil for you then fill that box with cat litter and put the stock in it for a few days or even weeks. This is time consuming but slow is almost always better in the gun world.
If you want ot go faster or if you can't seem to get the oil out of it with the warm box method, then you can soak it in acetone for several days or a week, then ethanol for another week and the let it dry for a week or more in a warm place. Some people think that acetone soaks can destroy the wood to some degree, but I have not found this to be true, personally. Still it is a concern. If you go this route, but a plastic turkey roasting bag and put the acetone and stock in that. The acetone does not dissolve those bags, but will dissolve most other ziplocks. This will minimize the amount of acetone you will need and will keep the entire stock submerged in solvent, although flipping the bag occasionally is probably a good idea.
You may never get all of the oil out, but you can get most of it. Repair any cracks as soon as the cracks are dry, and before more oil can migrate into them. Refinish the stock with a minium of sanding to avoid lowering the wood surfaces below the metal. You will probably want to bed the action and tangs with epoxy as the wood may be a little soft and wood/metal contact may be less than desirable.
That should get you started. Look forward to pics of the progress.