ok, as for the hot engine with twin carbys not being able to make a booster work...thats bullshit

when i had the landcruiser 4 spots and r31 rear with a 7/8th master i didnt have a booster on the car and that pedal feel would be fine for on the track when you sorta know when you want to brake and stuff like that. but if you were starting to pull up on the street and for some reason had to stop alot quicker it was pretty hard to get the required force in the time you had

then i went to the R32 4 spot front twin spot rears with an r33 15/16th master. i installed a booster then coz i wasnt really that happy to keep driving with the old pedal feel. took the car for a test drive then realised that the booster was dead. that was just scary, having massive brakes but still having to be pushing the pedal as hard as i physically could to get the thing to pull up like a stock 1200(the seat was flexing a fair bit i was pushing back on it so hard)
got a new booster on it and to say it was a completely different experience would be an understatement. with everything the same brakes wise and a working booster it pulled up better than anything else id ever driven
and that was with an L20b and twin 40s, then the really worked L18 with twin 45s, both of which allowed the booster to work fine
and even with the CA thats on boost almost all the time the booster still worked fine

its more a thing of how big you go with the master cylinder as to whether you need the booster or not, if your still using the stock master or anything close to the size of it of course your not going to need a booster
but anyone that thinks that boosters dont do anything and are just for people that are too weak to press the brake pedal hard enough...come have a drive of my car with the booster line disconnected