Hi,
That depends on what engine and what you are going to do with your cobra. I have a power rack and pinion from a 5 L mustang. It turns REAL quick ,15:1 ratio. With a big 460 up front and a wide set of tires believe me- I need a power rack to park this thing. If you are going to autocross the car you need a quick rack, the old mustang II rack is slow and your hands will be in a knot sawing back and forth on the wheel- go to a 14" steering wheel, much easier getting in and out of the car.
Perry.
