Use a 15/16" bore manual master cylinder for your Disc/Drum setup.
1" and 1 1/16" master cylinder bores push hard with little foot travel.
Here is a 15/16" Manual Disc/Drum master cylinder from rockauto:
.9375 = 15/16"
View attachment 1715753810
Application is 1973 Dodge Dart 340 manual Disc/Drum Brakes, 15/16" bore.
