Which "drag race" master cylinder?
Mine is listed in metric. Just a sliver over 1 inch. Wilwood fronts. Wouldnt want it any stiffer.
MC before this setup was the 1.125 with factory style disc. Again pretty stiff.
Both stop the car fine at the track. Would I want to take a 500mile road trip? No.
That being said....try what u have. I have rear drums. Dont use these opinions to take your setup apart...it may be just fine for your liking.