I took the stock on a chipped dinged Romanian SKS, stripped it, sanded it, stained it and put a layer of semi-gloss polyurethane on it.
It is now the most interesting stock I have in my collection.
If you don't like what you have I would start there. It is more interesting, much more customizable, and much more inexpensive than purchasing some other junk that is made for the SKS.
Got any photos? Is it a Chinese SKS56? Maybe it's a Sino soviet stock that saw use in Vietnam? Those are quite valuable and you wouldn't want to alter the finish in any way.
If you can post some photos, including a detailed shot of the markings on the left side of the receiver, I can try to provide some information for you.
As a collector, it makes me sad to hear about "improvements" made to uncommon SKS rifles. The Romanian SKS rifles, although not typically the nicest examples, are fairly uncommon as far as SKS rifles go, and if it has matching numbers is more valuable than the Chinese SKS56.
It's always best if you are going to modify a rifle, to do it so that it can be undone.