lexusLs400cork

any help welcome. I am a owner of a amazing car Ls400. She is a bit old but so nice to drive. I`m about to upgrade the wheels and to drop the car few inches down. The wheels I`m getting are 255/35/18 on the back and 235/40/18 front. Can any of u can advice me if it will be enough space under the wheel arch to fit those wheels and changing the standard suspension with the BC racing coilovers and without affecting the performance of the car . Any advice welcome thanks all