Congrats on getting the car's cooling system to this point.
One thing I always do in a "low slung car" is enter and leave steep grade driveways/ramps at an angle, sometimes at 45 degrees.... almost to the point where it is one tire at a time going over the gutter. Speaking of those, because of the pronounced gutters in Florida, I also take them slow to minimize suspension movement. It works well with the DeLorean..... I figure the less stress on the relatively weak front end, the better.... Mechanical Empathy if you will.
I recently drove a Diablo and that car seems to measure the ground clearance in millimeters.