When you use a large wheel/tire combo on the front, anything over a 9.0, 9.5" wide wheel and wider than a 255 tire you'll get what's called tramlining.
http://www.tirerack.com/tires/tirete....jsp?techid=47
This is when the front tire catches the ruts or groves in the road, mostly highway driving and makes the car difficult to control or steer.
Having a larger front tire/wheel combo is great for road racing, especially on large, heavy, high horsepower applications. With the larger rear tires like a 335 or 345 rear and allot of HP, the car is really going to push hard on the front tires, thus the bigger fronts with more grip will help this.
I prefer a 9.0" or 9.5" front with a 255 tire for street use in 18" or 19" sizes. The overall diameter is a good match with most of your larger rear tires. Take a look at the tire charts from the manufacturers and check the overall diameters of the tire sizes.
Hope this helps, good luck!