Hp number idea on new car

That’s a pretty abstract goal.
When it’s not clearly defined what you’re shooting for it’s harder to formulate a plan.

I would say in the 525-600hp range the difference between ported RPM heads vs TF240’s wouldn’t be huge and it would increase as the power level went up.

I use Hyper pistons in 440’s for street/strip stuff up to about 500hp.

Whether you realize it or not, what you really want is a stroker.
That will give you the seat of the pants feel you’re looking for.

Pump gas 505 with the RPM heads ported.
The right combo will put it in the 640-650tq range, and around 600hp and still be reasonably docile and low maintenance.

If you go about it in any “lesser” way, you’ll be wishing you’d done the 505 sooner than you think.

However, you’re at the point right now where you need to decide how much $$$ you’re willing to spend on it.
Ultimately, that usually dictates the direction of the build.