I own a pair of 70's, both in 270 which is the caliber God intended a Winchester 70 to be chambered in. One is a post-64 push feed gun and the other is a lefty with the pre-64 CRF action that was one of the last rifles out the door before Winchester closed the New Haven plant. The lefty has a beautiful piece of well-fitted walnut and will put three shots touching at 100 yards. The push feed gun was the first CF rifle I ever bought (in 1989) and has a laminated stock and a thin barrel. It seems equally as well built, although not quite as accurate. It shoots 1.5" at 100 yards.
The pre-64 guns are sought after primarily because of nostalgia, and because of the CRF action. My experience is that the older guns are 2-3" shooters in general. The old machinery Winchester was using to make those guns was ancient stuff driven by overhead belts, with so much slop and backlash it took a real craftsman to be able to hold tolerance with it. When they switched the design they switched machines as well and the post-64 guns were held to tighter tolerances. Or at least that's the story I read somewhere years ago. I can tell you I have never held a pre-64 that is as well built as my 2005 gun.