[Gunner]

I know zip about Backdrafts, but some general observations:

Power steering is almost never necessary in these cars, especially with an aluminized smallblock. If you have upper arm strength problems (arthritis, shoulder injury, etc.) you might want to consider it but otherwise it's unnecessary. Even at a standstill in a parking situation it's not much effort to move the wheel. Once moving - forget it.

With the amount of difficulty even the mildest engine build has hooking up to the pavement, I'd consider a limited slip diff a requirement. You'll never get a clean, safe launch out of the beast otherwise, even in slightly aggressive street driving.

If you aren't going to track the car hard, upgraded brakes are usually more for show and boast than function. ERAs use Chevy truck brakes, intended to stop vehicles weighing three times as much - it's PLENTY of brake for a light car. That said, the upgrade is usually inexpensive (under $1k) and it's your choice.

The main thing I wanted to comment on is your intention to drive it regularly, for work and regular transportation. This can create a problem with the insurance. Most of us have "hobby car" insurance that is cheap and fully covers the car's "agreed value," but strictly prohibits using the car as regular transportation, for errands, or for work. Obviously, this rule gets bent quite a bit by most of us but the insurers are tolerant as long as the Cobra is a car we only drive when we feel like it, not when we have to. (That is, we have a regular car to drive in bad weather, at night, etc.) If you are going to drive it 5-10k a year as regular transportation, you're going to need more standard insurance, which could be quite costly and may not fully cover the car's value. All things to look into and think about... good luck!