1968 Barracuda: 17x8 + 17x11 or 18x12?

heres what I'm running on the rear of my Duster build Billet Specialties Rally 17" x 11" w/ 4.5" BS and 390/40R17 M&H. Fronts will be 17" x 8" sorry not here yet.......

Sorry my opinion is for the 17 x 11, if the stance is right....