Tire choices for rallye rims?

I have been following this and other adds but still confused. I have also been wondering what size tires to put on my stock rallys and I want to go as wide as I can on my 72 Duster and still have them look like they belong. Going wider on the back is ok but I also want to go as wide as I can on the front without rubbing? What will work?
245, 235, 225, X 60, 65 70. Give your thoughts, what is the best combo?