My first model 70 was a push-feed, circa 1973. It was a good rifle but was only a 3MOA rifle, until I let my younger brother glass bed and free float it. What an improvement! Regrettably, I let that one go in '87. Currently, I have the Classic Sporter from the mid 90's, I believe. It's an even better rifle. It has never been bedded and floated since it shoots pretty well as is. For this rifle, I haven't found a load that shoots exceptionally well at 100 yards. Most recipes group around 1-1/2" for 5 shots at that distance. At 300 yards, I have one recipe that does remarkably well. I'm sure it could be improved with a bedding/float job; but I'm pretty content with it.
As far as model 94's go, there have been a lot of changes to them long before 1964. With some 7-plus million of them made over more than a century, it's no wonder. Want a model 94 carbine? There are several different versions of that over the years. New or used is irrelevant; buy the one that has the features you find most appealing. While I like pre-64's; that's not far enough back for my tastes. I find the carbines made from 1937-1948 most appealing. Shortly after that, they stopped checkering the hammers and substituted simple serrations. And then they shortened the forearm wood. If you go back to some really old ones the checkering on the hammers was in a, "tombstone", pattern; those were very cool.
Yeah, the world is going to hell in a handbasket, as my mother used to say. Even Winchester is now making plastic rifles, on the wide road with everybody else.