Wheel Offset??

Also what size tire would you run on the front for a 15 x 7 Wheels with 4:5 Offset? Want to fill up the wheel well as much as possible without scrubbing anywhere.
I have the same question. I love the look of a filled front wheel well!
Do you know that 4:5 offset is optimal? Is 4:5 offset same as 4.5" backspace?
Have a 71 Duster.