On my lt-1 powered 240 Z I ran 225's front and 250's rear. It was a great compromise for street and track days. This was with double adjustable Koni's.
For the last few years, I've used 350's rear and 325's front. It is not any fun on bumpy roads now. Even with extensive monkeying with the adjustable struts, it's still to hard a ride for my 45 yr old butt. I'll be going back to the other springs nest time the car is apart.
Mark