Yes there are differences. Mostly its in the lower control arm bump stop braces. 67's didn't have any, the 68's had them on the rear of the spring pocket, and the 69's have them on the front of the spring pockets. theres also some differences in where the lightening, or tie down holes are located on the front frame horns. don't know if there are mor differences between a Camaro and FB sub frame, although I think the the fuel lines in a FB come down the drivers side of the car, so there would be fuel clips on that side of the frame instead of the passenger side on the Camaros. May be some differences in engine mount hole locations, as the FB's did not offset the big blocks to the passenger side, like the Camaros did, the BB FB's definately have different cross members, but maybe the FB front mounts made the difference instead of relocating the actual holes in the frame.