Just had to put this eye candy on here in case you wanted to be able to dial in almost anything, from Guldstrand.
I did offset bushings. But after pricing, it wouldn't cost that much more to do these control arms instead. I'm not adding in new upper ball joints though, which might be needed.
I think the C5's run less camber in "theory" because the frames flex less. But I rode in a C5 Z06 with -3 camber up front with R6 Hoosiers, starting at 20 psi cold. His front tires were wearing even and that thing stuck to the track like glue, on a road course.