I happen to love that 4 piston caliper. In 1973 Chrysler cheeped out again and went to the single piston caliper.
I stopped a 9.4x 2750 pound car with 4 drum brakes. I spent a bunch of time on line pressure, pad area and made sure all that drums had as much thickness as I could get. Stopped like a dream.
Would I want to do that on a circle track or road race car? Nope.
I also didn't use off the shelf brake linings either. I used some stuff a local friction house had.
I think you can do what you want with a little thought, planning and math. Master cylinder bore size, and pedal ratio is critical.