The easiest 9" brake booster & master cylinder swap is from a 71-73 mustang and you can get the set up from www.gpsbrakes.com it comes with the master & booster & proportioning valve for disc & drum or disc/disc its it's relatively cheap .you have to cut a hole 2 3/8 using a good hole saw and drill 2xs 13/32nd holes about 1/2in away from the original holes where the master bolted up too its easyer to make a template out of cardboard then take out the top two bolts right above the master and bolt the template to firewall drill holesaw and the two smaller holes and then take bolts out and send the same drill bit threw them holes .cut the heads off them bolts mig weld them on the top 2 studs on back of booster .then where the pinch weld is right above where the booster mounts take BFH easy bang it up alittle .same thing with the lips on each side where the old master went send it in tighten it up hook up the brake pedal and Wella p.s. almost forgot you need the step down pice that goes on the brake pedal they give you both the reg.one and the step. They said if they get enough calls for it the will make it with the longer studs on top .
