71 Duster rear wheel and tire combination help

I am sorry I dont have the complete info. My 9" Ford rearend was built to center my 17x9's 275/40/17's in my stock wheel wells. The tire will fit in yours but uncertain as to how. You will have to carefully measure backspacing, and maybe even move your springs. Like I said my rearend was purpose built for the job, my spring location and tubs are stock.