17x8 wheels on a 68 Cuda Fastback

I was planning on running 235 or 245 45 17s. Seems like 5.5 bs might hit the upper arms. I just really don't want time tires to be too far into the body, and more outward. And what are you guys doing with the rears? Possible to fit 17x9?? Put these in the rear with just under 1.5" to the leaf spring and about 1" to the fender lip.