For safety - original bench or switch to bucket?

Get a new 2019 model year car..... that is the best peace of mind.

Old cars are dangerous, there is no way around it.

I daily drive a 68 dart that is totally stock, I sometimes think about how not safe it would be in a bad accident but I still drive it because i believe the odds are very slim.

If you are that worried, get a new car. Once you start modifying the old car with new equipment that was never made for it, you are taking away from what it is and try to make it into something it will never be.