I loved the look of 255-60-15s on the rear and 215-65-15s on the front. But that was for my FB. For a vert I'd do what Bill says. On my 70 Shelby I run 235-60-15s(fact tire size approx.) and on my 69 Mach1 I run 255-60-15s on the rear and 235-60-15s on the front only because I bought those "new" never used for less than half the price of brand new off of a store. If I was to buy new it would have been 215-65-15s on the Mach1. I think the 235s are a little big but that is what was on all 4 corners when I bought the car.