Old style crager wheels and tires fir my duster. Opinion needed

If the McCreary's aren't too old to be used, (BIG if!) $250 is a reasonable price for the tires, so the wheels are free.
Have you priced tires lately? A nice wide pair of T/A radials is $500.
I'm looking at about $2500 for a new set of six on my avatar car.
I'm not sure how old the tires are.They have still on that really doesn't mean anything.
I suppose.... How big a spacer can I safely run