I am switching to single piston(from '71 Grand Prix) manual discs from manual drums ASAP on my '66. Since I am really having a hard time stopping 4100lbs from 120+mph, I would like to have the smallest bore/highest pressure output master cylinder available. There are only a couple of parts countermen around here that can actually look up and find the best parts for me; but, if they aren't there, then the others don't have a clue. So, if someone already has a part # fo a 7/8" or 15/16" bore disc/drum master handy, it would sure save me some grief! I already have prepared the spindles,an adj. prop valve in the rear line, a combo valve for the disc installation, new calipers,pads,rotors,bearings,seals...so all I need is to bend new lines and install.Once installed I can figure out what length front brake hoses I'll need (braided).Can anyone help me out.And if anyone knows off-hand, the Moog# for '66 BBC front springs,and the correct Moroso# for the long wheel studs (heck, while I've got your attention, why not ask for it all?).I want to order it all this week, so i can put it together this weekend.I've searched many posts, but am still unsure of the best parts.Thanks!