I have 325/25-20 Toyo proxes T1 in the rear with NO issues..... same tire in the front 245/30-20 and I have the rear well rub as mentioned by Plumber. I think next time to go 235/30-20 front. Not doing anything yet because I can hear (and see where) it rubbing but it's not removing any material from the liners and will become less as the tread wears. Plus, in a few weeks when my Swift Springs come in it will be lowered and RWD converted so we'll see what effect that has on the alignment of everything. I'm running Elite Design Concepts wheels (made for the Gallardo) so I don't know the offsets without doing some research or ask EDCVin, also a member here........if you're not knowing offsets or running spacers then probably the 305 in the rear is a safe bet.
Too much wheel gap now, needs Swift springs: