273 Rebuild

Hi All
I'm a newbie here with a new to me 1964 Dart. I will have to rebuild the 273 motor and have a few questions. I've read a bunch of post about losing the 273 and putting in a 318, but I'm sticking with the original motor. That being said here are a few of my questions.

Can I put a 4 bbl carb on it?

I would like to re-ring the motor and new bearings. Are the parts available?

Any recommendations on things to do with the motor?

Thanks in advance for any help.

Paul