The nice thing about Savage (Stevens) rifles is that barrel changes are a DIY job. Pac-Nor and Shilen sell barrels profiled, chambered, and threaded, ready to screw in. Savage Shooter's Supply sells Savage barrels made on Douglas blanks, and there is an outfit whose name I do not recall selling Lothar Walther barrels for Savage.
All that you need is a barrel vise, barrel nut wrench, and headspace Go gauge. I am NRA Mechanically Inept and if I can do it, you can do it.
Of course there are gunsmiths who will install a Krieger, Hart, Broughton or any other brand you want, but it will run the time and cost up considerably.
Just what do you want to make this Stevens able to do that it will not do now?