Master Cyl / Wheel Cyl combo to maximize manual drum power

The factory service manuals will go along ways in proper setup of drum brakes, don't ignore there specs on things. I do not know of any secrets as far as swapping parts, ie master cylinder, wheel cylinder, from another donor, what I can tell you is there is certain criteria that needs to be met, the master cylinder bore diameter needs to be sized accordingly, it will typically be smaller then disc brakes, likely around 15/16" bore, too there needs to be a residual valve within the system. As far as wheel cylinders go, they are most general sized according to brake shoe size, ie a 9" drum will utilize a different size cylinder vs a 10". Good luck to you, I'm sure there will be others whom will chime in to give you more better reference to parts swap then I can, just be sure of what you are swapping will be compatible to all other parts!