Deciding on which rims and tires to buy so there is no gap in the wheel well.

Hello, I am new to this and I figured you all here would know the best information about this. I have a 2003 Stage 2 Roush and I was curious as to which Saleen Rims I should get and tire size. I noticed Americans muscle has a package that has 18x9 rims and they suggest 275/35-18 tires to go on them. Would there be a gap in the wheel well? I was told by a tire place that 275/40-18 would look better. Does anyone have any suggestions?
 
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