72nova suspension questions

Simply enough.. my suspension seems to be going out, and I'd like to replace it with some air shocks. I'm looking for a -solid- ride, and to lift up my back end some, to give the car a more muscle-worthy look. I've never messed with the suspension, so I basicly know nothing!

What's a good company to go with when buying these air shocks? Also.. what's involved in this sort of job, is it just a simple swap out?

ANY help would be incredible. I try to do all the work myself, but now I'm a full time student, and work a full time job. I need to know how to go about this, so I can be SURE my car gets treated as well as it deserves. PLEASE TELL ME WHAT YOU KNOW!! D:

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Car Specs: 1972 Chevrolet Nova, four door, 307 V8, true duel exhaust, remodeled power brake system, remodeled distributor system. The rest is stock.