Stock A-body master cylinders were 15/16" for 9" drums, 1-1/32" for manual floating disks, 15/16" for power floating disks, and 1" for the KH disks. The 1-1/8" master cylinders were for the 70-72 B/E body single piston KH disks and weren't used on A-bodies.
I like the 15/16" bore for manual disks. It's not really any more leg than was required for the manual 10" drums, which used the 1-1/32" master cylinder. I actually think the 15/16" master cylinder improves your brake modulation capabilities quite a bit with the slightly longer travel, but it still provides the max line pressure.
From the '73 service manual, "L" is the Dart model. The 2.75" calipers were B/E body fare, pin style in '73 hence the "floating" designation, the 2.6's were A-body slider calipers.
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From the '70 service manual, first the fixed caliper KH's used on A's
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And the single piston floating caliper KH's used on the 70-72 B/E. You can see the wheel options on the bottom for Barracuda, Satellite and Fury models (Plymouth service manual)
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