What do you think my HP is?

[RoushRacing6N17]

I just bought another stang, it already has longtube headers and a mild cam. I am not gonna do much to this one but what do you think my horsepower will be if I drop a set of GT40P heads on it with a Trickflow Trackheat intake. I will also be putting on all the little bolt ons like Underdrives, Throttlebody and such. I know that we can't be too accurate on such little info, but I guess I am just trying to figure out what I am gonna get out of those heads and intake. Also do yall think that I should go with those GT40P's or should I just port the E7's? thanks