The problem here is that calipers are not actually the same on a system designed with the "quick take up master cylinder". That was its official name in GM's 1981 patent application:
http://www.freepatentsonline.com/4445334.pdf
It is also known as a "fast fill" or "step bore". It was designed to reduce drag by keeping the calipers further away from the rotors and thus improve gas mileage. With the older model, the calipers are closer to the rotors and will clatter against them without applying the brake pedal. The m/c and caliper wheel cylinders are designed specifically to work together. The m/c in this system starts with more pressure, and the at a point specified by the wheel cylinders' design, it is reduced. Because of that, mixing and matching a m/c with calipers designed for the other system causes problems without the benefits of the system that it was designed to operate. There is also a problem with aftermarket calipers that were rebuilt from cores indiscriminately with the wrong seals reinstalled in the seal groves, or having one type of caliper on one side of the car, and the opposite type on the other:
http://www.remaninc.com/pdfs/lowdragcalipers.pdf
So, at a minimum, be sure that the m/c and the front calipers are intended for the same design on this car. (I omit the rear because both original and modified are/were drum, but otherwise would include the rear too.) Any kind of change in the brake hydraulics is a kind of reengineering of the original system that should require much thought, and if undertaken, sufficient road testing and comparison to be sure the system operates at least as good as stock. It requires more than just mixing and matching hydraulic system parts. See this warning here:
"Re-Engineering your brake system is a dangerous thing to undertake, DO SO AT YOUR OWN RISK! NONE OF THE ABOVE IS APPROVED BY ANY MANUFACTURER, I AM NOT AN ENGINEER. David"
http://www.pozziracing.com/quick_take_up_master_cyl.htm
What is recommended by one vendor is what they are selling, and not necessarily what is needed, or best, for the car.