I drive my 69 barracuda daily during dry season for the past three years, its got a 426 SB stroker and MPFI. Usually most of my driving is highway and secondary roads with little traffic, no issues there, but when I have gone to town there have been some issues from flat tires to electric fan failure and overheating (not badly but enough to see some vapor out of the radiator), alternator replaced twice, rocker arm retainers becoming loose one time, a leak in one of the brake calipers once, fuel pump dying one time, and I thats it. It may sound the restoration was not made right or using good parts, but I can tell you everything was installed new from known brand companies and the parts sometimes fail, an old car is not as reliable as a new one definetly. I guess they were not meant to go for too long without adjustments or repairs. And currently parts, even expensive ones, are not good quality always. The bright side of that is that most repairs can be done by yourself or easily at a shop at least.
In my case the engine has a lot of power and torque being a 426 setup, so I installed 2.7 gears in the differential to make my manual 4 speed transmission have low revs at highway cruising speeds and also to redice tire spin.
Need to add AC definetly, thankfully I live in a very high and dry area (6000 ft above sea level) so most times is cool, but driving in traffic is just terrible without air conditioning.
I think you can make the car a daily driver, but it will not be as reliable a se modern car. You need to have some tools in the trunk and be prepared just in case.
Take care,
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