I have a 1950 56C that is in great cosmetic shape but needed lots of mechanical work. I am in the process of doing that now and I have learned a lot about these cars. If you have any mechanical problems, feel free to contact me. Also, you can watch Del Siegman on youtube (
https://www.youtube.com/channel/UCnjMlCpEjLggWdGfpHOt38Q/videos). He bought a 1950 Buick 72 and he goes through a lot of mechanical work as he learns about the car. A good resource for information is Hometown Buick (
https://www.hometownbuick.com/buick-models/1950-buick-models/)
I am currently in the process of replacing my torque ball seals and pinion seal. My experience is somewhat different, and I will be posting some information when I have finished.
Great car and good luck. I love that body style