'64 Disc/Drum Master Cylinder Question

[theastronaut]

I had a '66 a few years ago with a stock non-power single circuit master cylinder, stock rear drums, and CPP's drop spindle/disc brake kit up front. The brake pedal effort and feel was really good and the front brakes locked up before the rear like they should so no proportioning valve was needed.

I'd like to replicate that pedal effort/feel when I redo the brakes on my '64 C10 but with a dual circuit master cylinder instead. From what I've looked up, a '66 MC is 1" bore; is there a dual circuit MC with a 1" bore on both circuits so I wouldn't have to use a proportioning valve? I'd like to stick with manual brakes, I don't like the pedal feel of power brakes.