Coy's C-55

http://www.coyswheel.com/coys-c55.html --- Alright well those are the wheels that I am thinking about buying when it comes to that point in my build...would like the 17"x8" for the rear and 17"x7" for the front, but the 17x7 only come with a 4" backspace, would that be too much for the front? And if anyone has any pics with some similar backspace in the front I would appreciate it.