To do what you want to do, you would need the following:

1. Boyds or other L/A stock setup for detachable box magazine and top bolt release
2. OEM Savage L/A detachable box magazine bottom metal (or hinged floorplate - both use same inlet)
3. Matching trigger guard for bottom metal.
4. May need to do some minor file/dremel work to the feed port of the action for clearance.

Simple conversion, but not the cheapest as the OEM bottom metal will probably set you back $150-200, plus you'll need to pickup a new magazine which will set you back close to $50 for an OEM 3-rd mag. Now add in a couple hundred for the stock and you're looking at an absolute minimum of $450 - more likely $550+ when all is said and done.