How much horsepower would my Trans Am have?

so i have a 1987 trans am and i am going to do some performance modifications to it and i was wondering how much horsepower i would have in the end. the car has a 305 tpi and all i have done to it so far is hollow the cat and put a flowmaster on it. i am planing on puting a ram air kit on it the hood and air cleaner, also a performance chip and maybe a set of hooker or edlebrock headers. so does anyone know what that would do for me horsepower wise and performance?