Your first source of accurate information will come directly from the vehicle's service manual. Get it from
www.helminc.com It is well worth the money it costs but shouldn't set you back more than $100 or so.The biggest headache in this modification is the steering rack. The manual rack is a simple rack and pinion design with no option for hydraulic assist. The power steering unit is similar but has two ports to route hydraulic fluid to and from the power steering pump. The service manual would describe in detail how to remove the steering rack.Find the same model and year car as yours at a junk yard and buy all the associated parts from the power steering:1. Power steering rack2. Power steering pump3. Associated Hoses4. Associated mounting bracketsPull the old stuff off and install the new stuff... fill with fluid, bleed out the air, and presto... power steering. I hope you are mechanically inclined as the steering rack is one of the more difficult pieces of machinery to remove from a car. Crossmembers, exhaust, tie rods, etc will have to make way for it's removal. It's not too bad if you get all the parts ready and give yourself a full weekend to do it. A brand new power steering rack would only set you back a couple $100 and may be the way to go too. A power steering pump could be as cheap as $40 too. So, brand new, I would expect to be able to do the job for about $400 if I didn't decide to replace my tie rod ends at the same time.Good luck!