I just picked up some Cragar SST's for the elky, 14x7 upfront and 15x10 for the rear. Now my question is what size tire should I go for in order to achieve a mild rake. I am not a big fan on the big buldge tire and would like something to keep it nice and clean, Kinda a sleeper. 8)

Is this a 5th Gen? If so a 10" in the rear will necessitate careful backspacing and rolled fender lips. I would use 65/70 series tires or the tires could be ridiculously small in diameter.

Well I checked the backspacing, and if I did this correctly the front has a backspacing of 3" and the rear of 5". Now since I haven't had the chance to see them on the elky, would you say they would stick way to far. I would preferably want them inside the fender wells rather than have them sticking out and giving it the lowrider look.
I am trying to go for the Pro Street theme with it.

You are going to need about 4 1/4 to 4 1/2 inches of backspacing otherwise the wheels won't fit.

The fronts should fit with no problem, the backs however will not unless you notch the frame and even then it'll be close depending on what width tire you run, and how much you notch the frame. 5" backspacing with an 8" wide rim will not work either (without 7/16" wheel spacers)...4 1/2" backspacing works with an 8" rim.