When I was a kid our car had only lap belts, and even those were optional. In the early ‘70s they had the attitude of building street tanks and that mass = safety. Doesn’t matter that the humans inside got tossed around like a hackey sack or to get an aortic dissection when hitting the steering wheel. It wasn’t until the last year of the ‘60’s that a collapsible steering column started being more common. By the late ‘70s they were starting to engineer for actual safety of the occupant. It wasn’t great at all by today’s standards, things like airbags didn’t really show up until the ‘80s, much less all the side curtain ones that are more common today.

Anyway, a modern vehicle is way better safety-wise, the debate would have to be about the speed of collision and the mass of the old car. Even though modern cars are safer, g-forces can be severe and no telling how the old car would crumple.