My "new" '74 Duster- or why I need a project like a hole in the head
18x9's with a 35mm offset and 275/35/18's would be just about perfect. The back will fit fine with no other modifications. In the front you'll need a spacer. Those are the exact same specs that I'm running in the front, but I have Dr. Diff's 13" brake kit, which adds ~5mm, and I have a 3mm spacer. Probably need a 5mm spacer instead too. So, my effective backspace on the front is currently 27mm for a 73+ disk set up, and it should probably be 25mm.
Something to consider- 275's will perform better on a 10" rim. I was initially trying to stay with stock UCA's, which is why I went 18x9's. Knowing now that the stock UCA's didn't clear the rims at full lock and full droop, I would just have gone to tubular UCA's like I have now, and a 10" rim.
Also- you'll probably need to have the centerbore of most rims opened up to fit over the stock brake hub, or even Dr. Diff's 13" kits. I had to have my Enkei's opened up. They started out at the 73.1mm they advertise, which is fine, but they taper down for a smaller wheel cap. So, I had them opened up to 73mm all the way through and made my own center cap for the front. I just cut down the end off of a generic metal pull through cap and JB welded a plastic center cap that also fit the original size centerbore onto it so it would kind of match the rears.
18x9's with a 35mm offset and 275/35/18's would be just about perfect. The back will fit fine with no other modifications. In the front you'll need a spacer. Those are the exact same specs that I'm running in the front, but I have Dr. Diff's 13" brake kit, which adds ~5mm, and I have a 3mm spacer. Probably need a 5mm spacer instead too. So, my effective backspace on the front is currently 27mm for a 73+ disk set up, and it should probably be 25mm.
Something to consider- 275's will perform better on a 10" rim. I was initially trying to stay with stock UCA's, which is why I went 18x9's. Knowing now that the stock UCA's didn't clear the rims at full lock and full droop, I would just have gone to tubular UCA's like I have now, and a 10" rim.
Also- you'll probably need to have the centerbore of most rims opened up to fit over the stock brake hub, or even Dr. Diff's 13" kits. I had to have my Enkei's opened up. They started out at the 73.1mm they advertise, which is fine, but they taper down for a smaller wheel cap. So, I had them opened up to 73mm all the way through and made my own center cap for the front. I just cut down the end off of a generic metal pull through cap and JB welded a plastic center cap that also fit the original size centerbore onto it so it would kind of match the rears.