That's probably not going to be an easy task.
These cars are pretty old now. Not a lot of mechanics specializing in them.
They could fix them like any other car, but when it comes to customizing, most likely you are on your own.
Nobody is going to want to risk wheels, tires and
suspension work and guarantee it works no rubbing.
All you going to be able to go by is experiences here and the issue with that everyone's situation is different.
For example I run a drag radial that is a 275, it is surely wider than a regular 275, probably more like a 285 or even 295 and I have no exhaust clearance issues and I run quad shocks.
Me personally, i'd just scratch 315's off the list.
A 265 or less is usually a pretty simple fit and is notably wider than the 225's that came on the car.