Hey, love your GTO. It is hard to choose a set of wheels, different tastes and different themes for cars. For me, maybe an Intro Vista wheel, looks like an old Hurst wheel, which were famous on GTOs like yours. You could have red line tires, too - if you want to push the retro thing a bit.
see the web sight below.
http://www.introwheels.com/pages/w_e...5_polished.php
that's my vote anyway. Maybe you could describe the theme of the vehicle you are going for?