It's got a fast rate hyd cam in the motor....... So it's not going to rev real high, whether there is potential hp up there or not.

The OP wants to take gear out of it to make it more street friendly, but doesn't want to kill the ET.

With those variables in place, there aren't a lot of options.

The motor should easily make 400hp, if the valvetrain will stay happy high enough in the powerband to let it.
The RPM heads would certainly provide enough flow to facilitate a hp peak of over 6000rpm, but I'm not too confident the lifters will allow that to happen.

This is one of those situations where the intended use of the car, and the overall combo in general would make it difficult for the engine hp and the on track performance to coincide very closely.