TVR Wedge 280i power steering conversion

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I have an 1983 Wedge 280i with very heavy steering.
Where can I get information on a power steering conversion

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It is very heavy.
And looking at forum all those without power steering are.
Wheels are quite wide and suspension seems fine with no camber issues.
Later models came with power steering, so it is way I want to go.

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Corsa conversion seems interesting as they are probably more available than Cortina Mk4/5 power racks.
I assume that is an arm rather than rack job.

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Anyone know how to wire up a Corsa B power steering for TVR 280i