A street car and you run the "Drag" look???? Explain. Are you refering to the "teenie bopper" idea of drag look in so much as huge fat tires sticking out of the wheel wells in back and little weenies in front, looking like your driving down hill all day? Or are you talking the real "Pro" idea of the drag look with big fat wide tires in back with equall or very close to or the same height of tire in front but not a fat tire, just skinny tall, and sitting level or close to factory level ride?
When you put odd size tires (diameter) you cause issues with steering aligment and handling. Can be dealt with to a degree but it really isn't the best way to go for a street car. I would stay with a tire that is as close in diameter front to rear as you can. You can go narrower with no real issue other than you reduce the amount of tire patch on the end that does the most work in reality on the street, the majority of your braking power is from the front, and these cars were designed with huge amounts of understeer in the first place so reducing tire size width wise also reduces your effective turning control.
That said, you have to do what "YOU" like and want to deal with. If you like the fat tire out the rear wheel well, then nothing anybody say's will change that, but I just thought I would throw out a little thought food for you. If your going to drive it on the street, always take into consideration handling and stopping, not just acceleration. That will provide you with a safe fun car that won't make you or someone else a statistic.
Personaly, I like the road course look of big fat tires on all four corners, makes the car look mean, handles even meaner yet and is wicked safe compared to what it was from the factory and even smokes todays computerized high tech gizmo cars that cost 100 times more. I run 245/60 15 on all four corners. Allows the ability to rotate the tires (necessary for PROPER maintanance of tires on the street) and makes for a much more balanced look.
