Anyone with lots of HP can get over a 100mph in a jiffy. You NEED boosted brakes! This can be either vacuum (not good with long duration cam) or a hydraboost. I set up my hydraboost for under $200 for everything. Brads70 has all the details from me and is adapting his, not sure if he is finished yet. I use the Cordoba discs on the front and 10" drums on rear. I cannot remember the width of the rears but they are the wider ones on a 73 340 Rallye car. These brakes will pull me down from over 120mph. Granted I would not do it continuously as they would heat up and fade but on the road what else do you need? A friend of mine has a 69 Cuda FB 340 car since brand new. It has 4 wheel drums and manual brakes. At 100mph it has more stopping power if you put your hand into the wind!!
I like the idea of adapting hydraboost using the PS system......is it a lot of fabricating? I have truck rear cylinders, the 11.75 front rotor swap (used to be drums up front......
) and a adjustable valve inline for the rears, almost wide open as I recall. The standard brakes work ok, but would love to have some extra power assist....and I have a big cam right now.