It depends on what front end/fork legs you are using.
You cannot use the larger F2/F3 calipers (that mount aft of the forks) without using those rotors. They are probably the best 750 calipers. Similarly, you can swap the entire front end (forks, trees, calipers, rotors) from a 1975-77 GL1000 for the best handling and braking (fork tubes are 37mm versus 35mm) and use larger calipers.