how low your car ends up in the rear is also a function of what type of rear shocks you are running and if the spring perches are adjustable....also you may not have to install a front bump steer kit....it depends solely on how low you take the front end.
I have Koni adjustable shocks front and rear, and with the stock spring perches and the Konis set as low as they will go in this configuration, the rear is still a bit higher than I would like.....I lowered the front end and did not have to install a bump steer kit, and I have no steering issues...period...
also with 180s in the rear, you may find you need larger front torsion bars to balance the handling of the car....with stock front torsion bars you may find the rear of the car to be a bit "happy"
180s in the rear are balanced nicely with 21mm front torsion bars.
like the orange car