I installed a hydro boost, booster in my 66 impala a few years back. the booster came from the junkyard and was of an 84 caprice. its a no brainer, just run the pressure hose from the pump to the booster, then from the high pressure outlet on the booster to the steering box pressure inlet. and lastly run two lowpressure hoses, one from the lowpressure outlet from the booster, the other from the outlet of the steering box, join them with a small y pipe, and run that into the return on the pump and your done.
it works like no vacum booster ive ever driven. i can lock all four wheels at 100 mph with a firm push on the pedal. (not that ive ever driven 100 mph officer...)
ant the units never wear out, so 100 bucks at the junkyard and some new hoses and your set, only thing is that you have to have the hoses made, but any good hydraulic hose company can whip them up in 5 minutes.