Which years of Chevy trucks will power steering gear and pumps will work in my 68?

[ubtripn]

That is great advice, I will give it a shot, I just am trying to see what a complete system looks like. LMC has a good diagram but still....anyway, the neighbor next door has a 71 GMC, ac, power steering, just rotting away. Made him an offer but no go. If I were to do the auto zone thing then what year of pump would I ask for? (I like the 20 dollars back for every 100 I spend there.) And about the steering gear, the yard has a 75 for 25 bucks, should I get that and just put a new pitman arm on it or buy a whole new steering gear?