Brakes: conversion Power to Manual

The pushrod has to be from a manual brake A body, the power one wont work. As for the master cyl you could use the one that is on the car now (assuming it's in working condition), if you decide to go with a new master cyl the smaller bore will give a lighter feel on the pedal. And there is no need to change to the two bolt style master cyl unless your looking to save some weight, the four bolt style will bolt right up to the firewall without any adapter.