Anybody running 17" Cobra Bullit rims on a Duster

I don't have any spacers on my 69 Valiant - BBP cop rotors up front, 65-67 B-body 8.75 in back, 17x8 +30 (5.7" BS) Mustang Cobra wheels. I could use a tiny bit more offset in back, but no more in front. 245/45's fit great, and 275/40's are good, but really getting snug to the inner quarters in back.

Clair