BFG comp 2s. 255/40/18 up front 275/40/18 out back. Front stays stock diameter and is nice and flush on the 9" rim, rear is a half inch taller than stock giving you a little more sidewall for launching and ride comfort and will not rub on a lowered car. Bfgs run wide so yes, 255 and 275 work well for those rim widths.
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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 ****.