The Z32 calipers will mount to the spindles w/o a problem.
You might want to get some new brake lines made for this application, no very necessary, but recommend.
www.takamotorsports.com sells them
The M/C can be left alone, but it will feel sluggish, change to the Z32 if you want to feel the full-force response of the Z32 M/C.
The e-brake line is not as hard as one would think, you can use come steel line clamps, it'll work and be safe, I used 3 on each line, total of 6 just to be on the safe side. It will work for the moment, until you buy the projectsilvia conversion, which is nice ... but .. Whatever...