One of the problems with buying a collector's rifle to hunt with is that you lose value if you mount a recoil pad.
Unless someone is just dead set on using a pre-'64, I really think the present M-70 is a better, technically safer rifle. And it comes with a recoil pad installed!
I also like the stocks better than the old ones.
A man I once knew bought one of the M-70's made about 1965. He encountered Jack O'Connor on a mountain hunt for sheep. Jack was polite, but my acquaintance said that he looked a little dismayed when he saw the rifle. Of course, O'Connor was carrying a custom-stocked older M-70 in .270. He preferred to talk about the cartridge, avoiding mentioning the differences in the rifles. But what he said about the "new" M-70 in print was the boldest condemnation of a gun that I've read by a major firearms writer.
The other fellow took his post '64 to Africa, too, and it killed plains game very handily. But it had cosmetic issues as viewed by a traditionalist, and I was exceedingly glad when the 1972 revision made the M-70 again a good rifle by modern standards. By the time they added the old claw extractor about 1980 and offered the Featherweight Classic, they were on track again.
I really think the present M-70's are the best production hunting rifles now made. Maybe the best ever.