Im assuming 9" wide up front. 265/35/18 will not bulge like 275 will unless they are nittos. 255/40/18 will be nice and flush and 26" diameter which is perfect. Your 305/35/18 are probably something like 26.4
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2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.