Front vs rear wheel sizes for best handling

Tire height absolutely makes a difference. The biggest difference is the roll center. The taller the rear tires, the higher the roll center will be. If the roll center in the rear is higher than the front, that changes handling characteristics. Even if the car sits level front to rear, but the rear tires are taller, the rear roll center is higher than the front roll center. You can change your springs and sway bars to compensate, but you have to compensate for the difference.

Next is that tire diameter changes the contact patch and number of revolutions the tire is making. Taller tires make less revolutions and have a larger contact patch, not to mention have more rubber. That changes the tire temperatures and heat distribution. On a street car you'll never notice, but if your planning on competitive racing it will make a difference if your front tires are up to temp and the rears are still cold.

Ideally, for best handling you should be running the same size tire all the way around. If you're making less than 500 hp that's especially true. If you think about it, more of the weight of these cars is up front. Most of the braking is done in the front, and all of your steering is. Absent a high horsepower car, the front tires are more important than the rear. GmachineDartGT has the right idea, same tires all the way around.

But it really depends on what you're doing with the car. A small difference front to rear isn't going to be noticeable on the street. And of course your suspension has to match what your tires are capable of. If you're running modern design tires with softer compounds you need the torsion bars and shocks to deal with the extra grip, otherwise you'll just max out the suspension and get a crap load of body roll. Conversely, if you've installed big torsion bars, good shocks, sway bars etc and then slap on a set of hockey puck BFG T/A's you won't have enough grip to load the suspension and the car will be loose and oversteer like crazy.