Looks like I will burn my 4" in the footwell.
This setup keep the steering angle from being too radical and keeps all of the extra stuff in front of my feet instead of at my shins. I'm a wee 5'9", and with my ass 10" off the rear bulkhead, I can barely touch the pedals, even moving the masters inside the cockpit. Truth is, rather than have the extra 4" behind my seat, this brings the controls back to the usual seating position, but moves the dash forward relative to seating position and makes it feel more open and spacious.
And for you Wolfman, a pick of a Mustang II/Pinto rack sitting above the Sprite/Midget rack. They're close to the same width, but the M2 rack input shaft comes in at a hard angle. This would mess with your pedals.