If you get the F-body set-up; take the shroud (look for one without the plastic hook on top for the hose for asthetics as you will not use the hook), the temp sensor from the manifold, the relay, and as much wire as you can. That should be all you need. I run a single fan on my car with a built 355 that is a daily driver and the car runs cool all day long, even on our 1 or 2 warm days here in Cleveland. Good luck.
Also, check the junkyard interchange post for more suggestions on what to get while at the junk yard.