Will they fit???

I found these wheels on craigs list and I am considering getting them for my sons 66 mustang project.

4 lug mustang cobra wheels

he has the original steel 4 lug wheels and another set of aluminum ones that were in the trunk when he purchased the car. Unfortunately the aluminum ones, while cool have to much back-set for the front, they rub on the control arms.

Will these fit? Anyone know what the back-set needs to be so we can look for wheels...

He is restoring this car to drive next summer when he turns 16 and wants it to be "cool"

Thanks

Greg