firebird brake question

[jonesbs9]

i put 2011 zr1 rotors and calipers on my 67 bird, I'm about ready to figure out mounting a booster and master. I'm using the ls9 with a larger cam. I have the booster and master from the c6 donor and had intended on using it. looking for thoughts on it, I don't know if I will make enough vacuum for the booster or not and am afraid of the pedal effort required if I use a manual master. I'm using the stock fire bird brake pedal.