Anybody running 17" Cobra Bullit rims on a Duster

I've done my duty and searched around for 30 minutes but haven't seen my exact question addressed. Another post in this particular thread talks about the difficulty of a Bullitt wheel when you have an original A body 8.75 rear (it's narrower). I'm upgrading to BBP and Wilwood discs out back which may push the track out slightly - we'll see. Otherwise right now I'd need a 4.5" BS wheel, and since the Bullit is 5.72", I would need a 1.22" spacer. That seems crazy big. Is that dangerous? Does this become dangerous at a certain amount of torque? 680 ft-Lbs (engine dyno)?