Fantastic car, congratulations! On the matter of road use and in consideration of driveway ramp angles I run 4.25 front and 4.50 on the rear. As for the tires, are the Dunlop CR82s on your car EU marked? I have customer cars equipped with Dunlop CR65s which have EU markings on one sidewall and "racing use" on the other. Might get you through. Given the high specifications of your GT40 and the as per original parts, the spring rates and Koni shocks should work well enough on the street. The GT40s were not brutally harsh and we've become used to some pretty stiff supercars these days, so you'll be fine with the shocks dialed in, ride height and corner weights set (at full laden weight). The car looks absolutely as new with no miles, have you considered a firm like Gelscoe for setting up the car? They could also fix you up with a Gurney bubble for the drivers door, something your going to need at 6'2". Totally jealous and smiling ear to ear! Cheers