MBM makes a great kit, and it's CHEAP! For ~$200, it comes with a dual master cylinder, and a 7" two-stage diaphragm. It will put you through the windshield.
I installed one on my '55 Customline, and I bought one for my '59 Galaxie (but haven't installed it yet on the Galaxie). They're all over eBay.
I saw this setup on my buddy's '57 Ford and fell in love with it:



Mine is a two-stage which is only 7" (a lot skinnier than this one to clear my Y-Block exhaust manifolds). Anyway, MBM has a complete kit for these Fords, and there is NO altering the firewall or bolt patterns. It's slick. - Dave
Royal Oak, Michigan (Four miles north of Detroit, and 12 miles NORTH of Windsor, Canada). That's right, we're north of Canada.Ford 292 Y-Block major overhaul by simplyconnected