That sounds about right, the manual brake pedal does sit relatively high. I went from power disks to manual disks and converted to a 4 speed at the same time and the brake pedal was about even with the clutch pedal height. I also had to readjust the brake switch but it sat with room to adjust still as well.
I’ve got a hydraulic clutch set up now so I may switch to an adjustable push rod and lower the brake pedal a bit since I can adjust both the clutch and brake to match.