I can't tell you exactly what line pressure is expected, and don't want to throw out a number that is wrong, but I might be able to help with the pedal setup.
I'm running dual master cylinders for the brakes, and I have Wilwood W6/W4 calipers. The W6s, (if I recall correctly) have a similar piston bore volume to the C6 Z06 calipers, but I don't know the rear Wilwood calipers would compare to the drum brakes.
I am using 3/4" front and 7/8" rear master cylinders and I have the balance bar set significantly towards the front brakes, and no proportioning valve. From my experience the 7/8" seems to move enough volume in relation to pedal travel that you need to make sure the pedal is pushing a lot more towards the 3/4" master cylinder. At the last RTTC I had the bar centered, or maybe even towards the rear after some tinkering the previous week, and I could not get the car to slow down at all!
As for the pedal feel. The pedal in my car is pretty firm. It isn't what I'd call rock hard, but it doesn't feel anything like manual brakes with a single tandem more master cylinder. There isn't a ton of pedal travel, and the pedal isn't what I would describe as "springy" like something you'd find in a new car.
If you have any other questions, or a better or more specific description I would be happy to try and help further.
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