salmon, is your suspension completely stock? The reason I ask is that I installed my friends Rally IIs w/ 235/60/15 from his 68 GTO on my Bird and there was no way the fronts or backs would fit without rubbing.
So I went with 225 and they still rub just a bit both front and back and I have a completely stock front and rear suspension. Altough my front and rear springs are about 4-5 years old so maybe they have settled enough to cause the issues with the 235...