The CR uses the VL commodore rack, you need to shorten the tie rods and cut a new thread on them.
I do not have power steering currently, but it is something I am thinking of fitting.
Power steering is not needed to make the steering lighter, but is beneficial for circuit racing due to better steering ratio (less turning of the steering wheel).
My car is also square tube, chassis number 3181.
I also added a lower tab to steering rack mount for added strength.
The seats in my avatar picture are long gone, I had them for rego (to give required back rest length). I now have low back buckets with removeable headrest (headrest always removed)
This is my car now (at 2012 Shelbyfest)
And at 2011 Nationals hill limb.
Waiting in pits at Nationals, side view.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.