With my '85 I want it to look as close to a stock four door sedan that was rescued from off the back a salvage truck as I can get it to look. But I really do need as big a tire as I can stuff under the wheel well for traction in the back; because unlike looking like a drag car, my car actually is a drag car that has to be able to put close to a thousand horsepower on the ground. First clue: there isn't a street tire made that can do that; so I have to use a slick. I try and use a DOT slick because it is street driven (won't pass safety tech at the track) and I am trying to pass it off as a stock car (wolf in sheep's clothing) so a set of 23 inch wide GoodYear drag slicks would scare away any potential rivals.
The reason race cars have big and littles is the smallest tire that you can find goes up front to reduce rolling friction by inflating it to maximum pressure. And the widest tire that you can find goes on the back running as low a pressure as you can and still drive the car in a straight line without crashing it. I assume by this talk of unequal tire and wheel size you are trying to make your car look like a drag race car; otherwise you would have the same size tire on all four corners of the car to maximize control and traction.
Road race cars use wider that stock tires to improve traction as all suspension begins and ends with planting the biggest patch of rubber that you can at all four corners and keeping it flat on the ground no matter what you are asking the car to do. So a NASCAR or SCCA car has 10, 12, or 14 inch wide rubber racing tires fore and aft to be able to apply brakes (drag cars do not have brakes on the front axle), and to be able to turn a corner (drag cars only drive in a straight line for a short distance).
So I am still confused on why you want different sized wheels and tires on a stock car (of course shinny fresh paint and waxing a car is something I never do either, so I guess I'm just different).