New Tires and Rims ?????

Yes if you running the stock stuff you'll have the 4" bolt pattern. You can run Mopar ralley wheels 15 x 7 rear with a 235 60 15 for the rear. On the front you could run the 15 x 6 with a smaller tire 215 60 15.
I'm sure others will tell you what they are running, maybe with some pics.
Here is a good thread to check out.
63-66 Dart. How wide of a tire on the back?