what do you think is the best stance for a 71 duster?

I like a little rake and very wide tires in the back. Muscular looking.

X2. Not a stinkbug air shock rake but just enough to let the more than the casual observer know your duster means business. X2 on the wider rears too. IIRC, 275's can be stuck out back without spring relocation.

Like longgone says, I'm not big on the "Foose Wheel" look either, but I think 16's would look right if done well. Personally, and this is my opinion, if someone made aluminum wheels that look like steels and were 8" wide for the rear and 7" for the front and dog dishes could be put on, I'd buy 'em. Kind of a sleeper/stealth thing. Stock look, better tire availibility and less unsprung weight.

Maybe black weldstars would work too, but I'd have to run raised white letter tires for that 70's look.