I can say that I have never said "Its Not do-able"
I am just here telling you honestly that your car can make a wide range of power given your modifications plan. And that biggest dictator with the power it makes will be fuel delivery. Since I have no skin in the game as far as fuel delivery or working on your car, I have no reason to sugar coat it.
Here is an example of the type of differences I am trying to explain...
Both are cars that I tuned myself, on the same dyno.
Car #1: Cam, Pump 91, 13psi boost...LT4
Factory HPFP ran out at 667 rwhp
Car #2: Cam, Pump 91, 13psi boost...LT4
Car made 801 rwhp, no fuel issues at all.
A few weeks later, car #1 replaced his HPFP with another factory pump, and now the car has no pressure issues.
So yes, you can make PLENTY of power with your combo. But to nail down an exact HP would be hard to do. But just like the car #2 I listed above, a LOT of power can be made when its all working as it should.
My suggestion, get a blower on her... and see how much power you can make with YOUR car.
Make the changes as needed to fuel your power goals.
Don't buy anything you don't need.