Has this car even been on the road yet?
No matter what you do Lee, here's some advice, at this point you can do what you want with it, take it or choose to ignore it, but don't do a thing, until you test drive that car, regardless if you plan on narrowing the rear end, or trying to run a wider tire, until you get that thing on the road, turn the front wheels lock to lock while driving, and start taking corners in it. I gurantee a test drive will reveal some truths about what you have there and what "fits".