The plan for the Crown car's brakes are to at minimum get discs on the front. My mostly stock '65 Corsa will out brake the V8 car everytime.
The drums are in good shape and all hardware and brake shoes, I just need to improve the overall braking of this car and I do not believe it needs discs in the rear too yet.
On a budget seems the Scare bird caliper bracket are the best and cheapest route to start and get there. I have some metric GM calipers and rotors already from other projects. Besides the hydraulic lines and brake pads I think that is all that is needed. Will the Crown brake/clutch master operate discs on front? Would a proportion valve also be needed?