gmkilla

Allright, got a questiom/statement. I was reading the real kmkillers article about 2.3 to 5.0 swap, which i did a while ago. It says that the master cylinder is different, but if you go to autozone, 4 cul and 5.0 have the same part number. I know the boosters are different, but I don't think the master cylinders are. But are the proportioning valves different since the ront break are bigger on the 5.0's?
Thanks guys