If you get a chance, I'd love to hear how what kind of clearance to the fender (top and rear) with the wheel turned if you were to test fit the 9" with 255s on the front with the deeper backspace (different offset).
Hmm, I hadn't thought to do that, but I will and I'll post back!
http://www.TheFOAT.com/92GTA 1969 Pontiac Firebird w/BP 461ci stroker kit, 670 heads & XE274H cam. Primer black with black interior. 1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.