I think big wheels make classics look like an over sized matchbox car. I live in a rural area, so big wheels would get bent around here. I'll stick with my 14s. If I were to change wheels(which I'm NOT), it would be 15s max.
BTW, my old Dart handles awesome with the 14s. It's about the suspension set up and proper inflation pressure, not how short a sidewall you can run. But that's just my opinion.