Hello,
My master cylinder is different than the Z32 : diameter 25.4mm. The other differences are the brake booster and the rear brake piston diameter.
About Skyline R-33 brake rotor needs 17" wheels (I've got standard at 16", so doesn't fit).
I think for the first step : Good brake pads like Ferodo DS 2500 + stainless braide hoses. And perhaps better rotor, treatment, grooved.
I know there is brake upgrade kit, with larger rotor, and bracket to mount them with the standard calliper. 310 mm is the maximum in standard wheel, see on
www.apex-performance.co.uk.