Master Cylinder - 67 Barracuda converted to front disc brakes

1967 Baracuda was upgraded to front disc brakes by the previous owner.
With all the "cobbling" that they did on the brakes, that we have fixed, do I have the correct Master Cylinder?
I've now got 4 Piston Willwood caliper up front; but the pedal doesn't seem any better than it was with the MOPAR single piston calipers.
I guess that I was expecting more pedal.
Wondering if the previous owner put the correct master cylinder on her for the front disc brakes???

Yes, there is a proportioning valve mounted below on the frame.

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