Time to Buy Tires for the Duster......help please.

Doc,
I found a pic of mine, mounted on the same size rims as yours, with 275-60-15.
Bolted to a 8.75 stock A body axle, but converted to big bolt pattern using Dr. Diff axles.
Springs are Mancini X-heavy duty with a 1" lowering block.
Ny87vQ.jpg