I *almost* went with the same exact tires as the Duster... but changed my mind this weekend when I ordered them. I wanted 26" front and 27" rear, so I went with Falken Azenis RT615K 255/40-18 and 295/40-18. 0.4" taller on front, 1.1" taller on the rear.
I fit a 18x8 with a 245/40-18 on a '65 Barracuda last Thursday. Looked like there was a little more room. That car had an AlterK and was running 17x8 with 225/45-17.