I did this about five years ago so I don't know that I remember exactly what I used.
And while I used the Chevelle rear in its entirety, at the front I bought new rotors and calipers, and used the bearings that came with the rotor, and with the disk conversion kit.
You don't need the spindle, but if you are going to use the donor parts, I'd take everything off the spindle and keep it till I was done.
