On my '55 2nd series with a stock 235 and 3 speed manual trans I used an ECI power front disc brake setup with my stock rear drums. Double 8" booster pushed the new dual master cylinder back so I had to cut a new access hole in my floor. I then put my bench seat on hinges to make it easier to access the cover. Yes, the stock 235 generates enough vacuum to service the booster. I probably did not need the booster but it now stops like my wife's BMW. Photos are at www.picturetrail.com/motthollow.
