Like the title asks,

ON your race car, who has 4 wheel manual disc brakes.

How well do they work and what are the parts, or kit you used?

my A body disc brakes (73 dart front), inline tube dana 60 rear disc conversion DR.diff master cylinder around 1" bore, and wilwood proporting valve. My brakes are flat out bad. They do work, but not well, I could never lock of the tires. NO MATTER HOW HARD I PRESS!

They bleed fine, both front and back, but when bleeding the back the brake pedal will not drop all the way to floor, like when bleeding the fronts.

Not sure what my problem is, I am not bove just replacing parts till it works.