17x8 wheels on a 68 Cuda Fastback

I know you have already decided to send the rims back, but i think its the right decision. Dont limit yourself, you never know what mods you plan on doing in the future that you may need that room. i am running a 9.5 wide up front and a 10 in the rear. i wussed out and only did a 245/40/18 up front. the tire looks a bit stretched on the rim but was my first time with the setup and wanted to be sure i didnt have any issues. it always sucks getting a nice new shiny rims and having to send em back. but i think your making the right call.