about how much?

well i am now looking at this 89 mustang GT. It has the 5.0 302 bored .30 with the H.O intake, cold air intake. A new $475 X pipe with new mufflers. headers. aluminum head ( don't know what kind) and a bigger cam. It also has 3.73's and it is a auto with a shift kit and a B&m slap shifter. How much hp you think it has? i know it is hard to say because i don't know what kind of heads are in it or how big of a cam, but the motor has rough idle so the cam is pretty big. it gets 1st,2ed,and 3rd gear scratch.