Look into electric assist power steering. It's simpler, and probably less expensive than trying to adapt any sort of hydraulic boost steering system. Definitely stay away from any sort of power rack & pinion with the straight axle. Those things are a fatal accident looking for a place to happen.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!