Back Spacing

Keith Mopar said
I ran 16 X 7, on a couple of A bodies, It had a 5 (actually 4.92 in brochure) inch back space with no rubbing any where. This rim had about 3/4 of an inch clearance to the upper ball joint. I had them on a 71 Scamp, 74 Duster and a 65 Cuda. I had 225 50 R 16's on them. I could of used a slightly taller tire on the later A's. like a 225 55 R 16 to fill out the wheel well but it looked ok.

I am running 18's on the front and would like to go as wide as possible. Do you think an 8 would fit? I don't mind loosing a little turn radius for a little more rubber.