Yeah, we all know BDR's are faster on the track than a GT-40 with Gulf colors, sheeshhh.
Ride height: I posted the right answer way back toward the beginning of this thread, 5 inches is a basic industry standard, go from there. That will clear most of the obstacles you encounter on the road. Measured from the FRAME. Why the frame? Because cars, ALL cars, are notorious for having uneven wheel lip clearance as measured from a flat surface and left to right side. Therefore, wheel lip clearance or tire height clearance is a "ball park" at best with way to many variables to even seriously consider. Not to mention different people run different tires, a whole nother can of worms.
Want to go racing? You would be well advised to check with the TRACK first to see what THEIR minimum ride height requirement is. The track will specifiy it, not BDR, not SPF, not Street Beasts. Typically it is four inches, some tracks don't care, some drive ways don't care, then set it as low as you can and still maintain decent suspension geometry. Can't do that? Then start buying parts, to modify the suspension to get it to work. Like everybody else on the planet does when they lower their car to go racing... Don't forget the extra cool ricer wings for the front and the rear, I won't laugh, promise (NOT).