First SKS

Just picked up this Chinese SKS for $350 USD. I'm trying to figure out what I have.

Seems to be numbers matching, except the barrel. Looking up the serial it seems to be made in 1957 but it has a spike bayonet which I thought only later commercial SKS had.

The stock is in pretty rough shape, has lots of wear, and two cracks near the wrist. I removed the rifle from the stock and the wood inside is a little rotten.

Should I salvage the stock or try to find another surplus one? Thanks for your help! I look forward to shooting it!