You don't say what your budget is. That really helps.
Buy a finished and sorted car. If you're not mechanically inclined, or simply don't want to tinker, then a Cobra might not be for you. All of them to some degree or another require "maintenance". They are 60's race cars after all. Getting fuel injection will help some but don't go so far as to get a Cobra with a Coyote. Just as well get a Corvette.
Never buy a car that you haven't sat in personally. They are all different in the way they "fit". I tried on a Superformance and found that when the seat was in the most comfortable position for reaching the pedals that the steering wheel rubbed on my lap. If you can't see the car in person, then at least "try on" cars from the same manufacturer.
Never buy a car sight unseen. If you can't see it your self then get a per-purchase Inspection (PPI) by a reputable Cobra expert.
Look on
427 Cobra Country--Ford AC Cobra replica manufacturers SUPER-SITE for cars for sale. It's the best place to find one.