I'm a big fan of Ford's machined aluminum wheels. There is something very nice about the machined look on vintage Mustangs. Anyway, those should look very nice, especially if you lower the car an inch or so. Bigger wheels don't look quite right on a car that sits too high. JMHO...
My Ex had a 97 cobra with those same wheels. I once tried them on my 67 but the fronts hit the upper A frame and the back's set a little too far under the car for my tastes with 245's. But they looked pretty good and would've looked better with those things changed