You can use the entire front end suspension and steering. You can do this by swapping everything including the crossmember, or just the control arms, spindles/brakes, and steering components to include the steering box. You can also get use the rear brakes if you swap to 5 lug axles. The key to all of these parts is they are much less expensive and more readily available at you local parts house.
Also, check out this thread for good info on front end swaps:
http://67-72chevytrucks.com/vboard/s...68&postcount=4