Sorry you just lost your Dad. That's cool you are keeping t he '57 up for your mom to continue going to shows in it.
There's kind of a story about my '55 too. The reason that's what I had to have is that I was born that year and my Dad bought a new 2 door 210 with a 265 that year too. He loved that car and always talked about it and how it would "skid" the tires (leave rubber). It's long gone though. He got hit hard in the quarter panel in '57 and chose to give it up and get a new '57 sitting on the lot. It was a 4 door Bel Air with a 6 cylinder and he just didn't like that car as well as the '55.
I wish he was around to see my '55. I know he would love it.