if I was you, and if possible, as I am just not sure
maybe look and see if they sell full-sized stocks for it, and maybe sell the youth stock, many savage rifles all use the same stock, so, you might find someone wanting a youth stock that may even swap you
I also know they sell spacers for the recoil pad,(way more common with shotguns, but sure you can fit them to this rifle) that I imagine you can add to get as long as you want, but if it was me, I'd suck it up and just get a solid stock of correct size, than have one pieced together