There will be a thousand opinions on tire size preference on this site. My suggestion is to search the site on "tire size" or "show your rims and tires". There are literally hundreds of pics,opinions, on the thread. I can't choose a tire for you, because our tastes are way different.
I prefer a 215/70-14 or even a 205 on my cars. But that's just me.
Well, as my dart is a kinda collection car now, even being just a survivor, I do not plan on driving much. The 205 70 R14`s on the car now are like 20 years old and look brand new still, but need to be replaced.
I am going more for the look because IMHO a 205 looks skinny but may be better on snow or rain...
The major concern would be if the tires would wear more on the middle using 7" rims and to avoi that I`d have to lower the tire pressure.