It would work, if you dont mind the tires screeching on corners, and broken axles. You need to have some slip on the street, or things will break. Spools and mini-spools should be considered as track only.
I shimmed the spider gears in my 9" with one extra shim and it seems to be somewhat of a limited slip. You really have to reef on it to make it slip it's a little jerky when it slips but I would rather have the jerk than the whole car slamming all over the place. The 8" rears are almost the same as the 9" I used the 8" shims to shim my 9"
I have not driven it yet but it's in the car and with the wheels on you can't turn the wheels by hand when it's in gear.