No, they won't bolt in. Of course, if you are handy, anything can fit in anything. I doubt the rear seat is wide enough for your Impala, however.
Respectfully, I will say this: unless you are doing a modern Pro-Touring style build on your Impala, those seats really don't fit the style of the car. If you want to find something a little sportier, but that still fits the style, consider some factory GM front buckets from 65-up. Just because those DeVille seats are cheap, doesn't make them a "deal".
Two doors, four doors, wagons, and ragtops.