700 horsepower and a dry sump.
This is a tough debate. If you have kids that want to ride in the back seat, you are building the wrong car in my opinion. With the chassis and engine you plan, you need at least a 6 point and race belts. Only you know to what degree you will use the car. OK, maybe you don't know until you turn the key and get out to some events.
So, as the old saying goes, you can't bake your cake and eat it too. What's important to you? Your kids safety, your safety, streetability, track compliance? Only you can make that decision and it's an important one for the function of the car.
You really don't know what a missile you are building. That goes for you to Ron. Believe me, 700hp will motivate anything down the straightaway in a big way. I've run a couple road courses with speeds pushing 140, the thought crosses your mind! And it does and will happen to someone in this community, eventually. I'm not trying to be a downer, I just think safety is vastly under thought in this community.