p/s swap question

[blacktruck]

I've looked in the FAQ (maybe not as thoroughly as i should have) I'm wondering if the GM p/s gearboxes are interchangeable? For example would I be able to take the gearbox out of my 2nd gen camaro and put in my '72 c/10? Is it possible to grab one off a later IROC? I'd like a quick ratio box without going into a lot of hassle. the pitman arm is different between the manual steering and power steering. what about the connection to the steering column? Thanks for helping out with my homework!