Tire Size of my 64 Dart

Sure. Those 205's aren't that much bigger. I put 225/70-15's on the rear of my 66 (same wheel house as yours) on a 15x7 with a 4" backspace with no rubbing. Here's a link:
http://www.forabodiesonly.com/mopar/showthread.php?t=241504

Welcome to FABO! tmm