My niece has a 55 Chevy that she’s going to sell because her husband passed. She doesn’t want people coming around her house and needs a reputable person to sell it for her, go between type. Is there a 55-57 site to go to like Moparts?

trifive.com is one that I know of.

Here are a couple of forums to get you started....

https://www.trifive.com/forums/

https://trifivechevys.com/

If by some chance it's a Bel Air 2-door sedan, turquoise with white roof, matching interior, and was a 6/stick car, let me know.
Might consider other colors, but that color combo means something to me.
For that matter, I could be open to other drivetrains.

4 door but everything has been changed or upgraded in body interior and suspension