Can I run 17x11" wheels in the rear on a '71 without any mods?

Describe 'mods' ??

You'll have to roll the fender lip. And the seatbelt hump. Depending on what is left, there MIGHT be some tire rub on the inside with the shocks.

Thanks rs. I meant without any changes at all. Looks like I'll go the 17x9.5 route, same exact setup as N-Memory.