17in Fender Rubbing issues

72bluNblu said
If you ran 17x8’s with 5” to 5.25” of backspace you could run 245/45/17’s all the way around.

How sure are you about that statement? I am looking at putting 17x8 on all four corners of a 69 Dart with discs and 8.75; no rear spring relocation.

Also, are 50 ratio tires (on 17”) never an option?