One second.
it's BRAKES
Ok. now that that's out.
Z32 brakes are the easiest thing for you to get.
http://importnut.net/300zxbrakeswap.htm
There's a total walk through for you. He did it on an S14 and included the 5 lug swap. You can overlook the 5 lug swap and it should still apply to your application
Also, do a search. it's covered, ad naseum.
And in regards to the master cylinder question you have.http://www.sportcompactcarweb.....html
will put some math behind why it's a good idea. Just look down about 1/3rd and you'll see the portion of the article.