I'm in the same boat, I need help as well. I'm thinking about lowering my 300m special, I already have 20' wheels and the eibach springs, just don't know if it's going to be too low with the ground effects the car has.
Thanks guys.
From my point of view there's gonna be enough space between the fender and the tire to lower the car safely with no problem Anyways , I'm gonna do it no matter what! Thank to ALL of you for the MULTIPLES answers!