If you are going to do any kind "acceleration runs" or put any kind of sticky tire on your Chevy II go for as a minimum an 8.2 out of a 64-67.
A set of axles in it would not hurt; it does not take too much to break 40 year old shafts. It would probably be a good time to put on front disks or at least a five bolt conversion for the front also.
