A 1956 model 70 standard grade in 30-06 is nothing special. It should be priced pretty close to a new Ruger. For the same money the Ruger is a better gun. Winchesters of that type have no colletcors value.
If you are thinking about paying $200 more for a nearly 60 year old rifle you would be better off buying a new production Winchester for the same money. It will be better than the pre-64 and the Ruger.