The car has a double chamber fatty master cylinder in the original position on the firewall. It is all rusty and the cap seems to be not sealing well. I wanted to change it anyway because it looks like crap compared to the rest of the engine compartment. I think the previous owner swapped the master cylinder with this one. When I did try to bleed the brakes, the pedal would get firm but then it would get soft again. No leaks anywhere. When I drive it there is no psi on the first push. It takes 2 to 3 pumps to get some psi. It will stop the car at normal speeds. I can't imagine screaming throught the traps at 140 mph and trying to stop my Chevelle. The wilwood discs should stop on dime, I presume. I just thought aftermarket master cylinders created more hydraulic force than a stock one. The aftermarket ones don't seem to hold more fluid than a stock one although I have seen reservoirs for extra fluid. I am going to start with a rebuilt GM master cylinder and bleed a river throught the system.
I really appreciate the feedback by all. I'll post my results.