On installing a master cylinder/booster to a 41-46 chevy i just finished installing one on my 46 with 350/350 i mounted it on the fire wall. hung the pedal to the left of the steering,ive looked and called vendors and nobody carrys a bolt in mc/booster for 41-46 trucks.most of the rod shops around sac calif and guy named tim who ive emailed on this same subject.said to just mount it to the fire wall.so,if you are looking for a cool guy to help with this set check out the gallery in stovebolt pictures and take a look at his truck,and email him he istalled his master/booster under the floor,anyways good luck