Master Cylinder & Booster for Disc/Disc Brake

Hi Gurus,
I upgraded my 65 Fastback 4 speed manuel disc/drum brakes with, front Cobra Disc Brakes and single piston rear disc brakes. Brake pedal performance is not enought for me. I want to upgrade master cylinder and booster.
Which combo is the best?
Regards,
Musa
 
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