Can a classic car be used as a daily driver?

Would a 1951 ford custom be a good daily driver car?

Sure, as long as you do a frame off restoration, toss a new engine and tranny in it and do lots of preventative maintenance.

Otherwise, nope.

Sure, why not? That would be cool even if it is in need of restoration you would get more looks if it is in fair condition and runs good

Why not
As long as its been kept in good mechanical condition

Even in good condition vehicles of this era require a lot of maintenance. Parts may be an issue. The brakes are not up to modern standards and there's very little in the way of safety features.
These cars ae good for weekends but every day unless you are a good mechanic can be a major issue.

Depends on if you expect to drive it like a modern car. It will be slow, and have terrible brakes compared to a modern car. My personal opinion? Do it, thats a great car.