Your front space is the important number. Deduct 3.25 from whatever size rim you choose. If it is a 8" rim, you need 4.75, 8.5 rim, 5.35, 7" rim, 3.75. This will keep you outer wheel profile where you want it.
As for tires, when choosing you need to look at overall height and section width. You need to be sure your front tire is the same height or shorter then the rear because the front tire has less lip on the wheel and is more narrow, it already will try to look taller then the rear even at the same height. If your front rim is 1" smaller then your rear rim (18" rear, 17" front), you need to be sure your front tire is at least 1" shorter then your rear tire.
Section width is another concern you want to be sure the over all section minus the width of the rim is less on the front tire then the rear. In other words, you do not want a front tire with a 10" section on a 8" rim (1" of tire bulge per side) on the front, and then have a 12" tire on a 11" rim on the rear (1/2" tire bulge per side). It tend to make the front tires look wider then the rear. More tire bulge on the rear looks OK though.
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Frank Serafine
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