Tire Questions???

I have a 2000 convertible GT that has H&R Sport Spings (1.5" drop front, 1.25" drop rear) and am currently running Falken 255/40/17's on AFS 17 x 9 Chrome '03 Cobra replicas with 26mm offset. My questions are;

1) Can I go to a 255/45 without rubbing in the front?
2) Can I go to a 265/45 or 275/40 without rubbing?

Thanks