If you want to go manual, on your 4 wheel disc set up, there are several aftermarket manufacturers making masters in the 3/4", 7/8" and 1" bore configuration, smaller bore, more travel, make sure a master has the fluid capacity to meet the calipers used, so it won't run empty on a full stroke, pedal MA (mechanical advantage) ratio may need to be increased,....I'll post the list of factory boosters if you wish to choose from that list...


FYI,...IMHO I'd stay with the power set-up, that's just me, as a comparison, my 70 Charger, 440/6 5 speed OD, cam spec .520 lift, 285 dur. and 10-12 inches of vacumm, I run a Bendix dual diaphram booster, 70 B body 1 1/8" master, factory pin type calipers up front, and a SSBC rear disc set up (Thunderbird SuperCoupe set-up basically)...and a vacumm reserve canister under the battery tray (factory set-up)...my TOTAL pedal travel is 1/2" MAXIMUM to achieve 4 wheel lock up, pedal effort is NON-EXISTENT, in fact it requires a very light touch....

Mike