For modern shoes that are most like the `70s models, I'd recommend the recent Nike Skylons. They have minimal heel lift and no gimmickry.
That forgotten sawtooth-soled brand was the prototype New Balance. I got a pair in the mail, but they felt very weird and I sent them back.
I also sent away for a pair of blue kangaroo-suede Arthur Lydiard racing flats in 1977 after seeing an ad in Runners' World. (They were sent from New Zealand and took about a month to arrive.) They were like slippers--hardly any cushioning at all, 5 ounces apiece for a U.S. men's size 10. They felt great, and I ran a marathon PR at Boston in them.
Ralph Serna, who won two NCAA DII XC titles (he tied intentionally with two UCI teammates, Steve Scott and Eric Hulst, the second time), always trained in racing flats. He was doing high mileage and ran 2:14 around then, and I don't remember him ever getting injured. He weighed about 115 pounds and had as perfect running form as I've ever seen, which may have let him get away with the racing flats, but I think you're on the right track to be looking at the "less is more" shoe idea, as explained well by Chris McDougall in "Born to Run."