The 275's? No. On a Dart with the stock spring location I think 255's are about as wide as you can safely go, and I'd stick with 17x8's with 4.5 or 4.75" backspace. Up front the same set up will work, 17x8's with 5.25 to 5.6" backspace. You can go bigger up front, but the stock wheel wells out back on a Dart are much more limiting than a Duster or Barracuda unless you do a spring offset or 3" relocation and mini-tub.
I tried the same 17x9s with 5" bs and 275s on my 71 Dart, I managed to get them on but they touched the springs AND the quarters.
