[Dragsinger]

All the above comments are valid.

In my experience with engines in the 700-horse range and cars in the 3000-pound range, a 2 or 3-degree down angle works well. And as stated above, the down angle is in relation to the body, not the ground.

If you want the ultimate set of tools. Build yourself a set of stands or tables about 30" high. Set up the car, at ride height, driver weight in the seat, and rear wheels removed.
This offers an excellent view of your setup plus allows easy adjustments.

Beyond this, a drive-on rack is perfect but few of us have those.