I have a 69, I'm running P255X70R15 on 15X8 vett ralley's on the rear and P205X70R14 on 14X7 Camaro ralley's on the front I rolled the rear lip in, still has the same factory rear leaf springs that came with the car in 69, has front disc brakes, The front coils have been cut one coil you can see how it sits in my pics http://pg.photos.yahoo.com/ph/firebird69racer/album?.dir=dfcc&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/firebird69racer/my_photos