How much power can our chasis take?

What I mean by this is for example, the Z was made from Nissan balanced very well. So it was tuned to work well as a unit.

However, if one goes FI, is there a certain power level that the chasis was not meant to handle?

Another way of putting this is, for instance, the new GT-R to come, C6, or any other car with higher power, the chasis was probably designed well to match the power for fantastic handling. With the Z, it does not have this power, but with FI, the balance is gone.

Should this be a concern? If so, is there a way to strengthen it?

I plan on eventually having appx. 500whp/tq to the wheels and I plan on using it as daily driver and Track events. I here that if you go too much power, you can't handle well and all you have is a drag strip car.

I'm new to all this so I am gathering as much info as possible so I know exactly what I want before I begin to build.

Thanks.