I used to have a '70 Chevelle as a daily driver. Aftermarket big block (540ci), loads of fun to drive. Obviously sucked a lot of gas. It had some electrical issues that I could never get nailed down.
If you are mechanically inclined and don't mind fiddling with a carb (floats, jets, etc.), timing, brakes, etc., then an old car can be a lot of fun for a daily driver. Otherwise, find something else.