Daily driving an A-body
My 71 Duster has been my daily driver for the last 10 years and it's been the only daily driver I've ever had. It has a slant 6 and gets really good mileage.
Here is the thing about daily driving an old car. It's cold in the winter and too hot in the summer. If you put A/C and all that fancy stuff in it, then it gets bad mileage. There will be annoying rattles, squeaks, vibrations and random problems that will irritate you to no end. If you are smart about it and don't put money into the car senselessly, you'll save a ton of cash over the years. You have no car payment and your insurance will be dirt cheap. Compare that to your buddies that have to pay $400 a month just to keep their Silverado or whatever they've got. You have to pay $50 a month in insurance and your gas bill will still be low if you get a slant.
It's definitely worth it if you can handle the uncomforts of driving an old car. Just don't fix it up too nice. It's tough to keep a daily driver in really good shape and it's just pointless stress to worry about your really expensive paint job or whatever else you've done to it all the time.