PowerSteering?

Hi.
I´ve been told, that I have to get a manual steering for my Plymouth Barracuda if I swap to a Hemi, and want to mount TTI headers. Are there any alternatives so I can keep my powersteering as it is? If the answer to that question is NO - how much do I have to buy? Manual steering box, steeringcollum?? I dont know if the power and manual collum is the same..

Thanks

Eivin