Savage Date and Barrel Length Questions?

[kma78]

I recently bought a Savage 110 30-06 with the serial number 359**. I am assuming it is quite old but cant figure out the year it was made. I tried measuring the barrel by putting a dowel rod into it until it stops and it comes up 20". I don't see any early Savages in the Blue Book with that barrel length. It has a plain Monte Carlo stock no checkering. It has a blind magazine with metal on the bottom of stock. I was wanting to customize it a bit but I am thinking it might be too old. Any help would be much appreciated.