Well, if you want more horse power on the savage/s40, it's simple!
Step one, remove engine/transmission
Step two, search for engine with the same or close dimensions with more HP
Step three, cuss, swear, bleed, bang your head, cut , weld, grind, re-measure, cuss some more, repeat previous steps.... until engine and transmission fit.
Step four, realize it isn't a savage anymore and sell it to buy another savage.