Competition suspension gave you, among other things 6.70 x15-4 ply 170 mph. I think they were called Speedway 200 tires. The option was available with the S code or the K code engine. You would have thought that a limited slip rearend would be part of the package, but that was a separate option. A good friend of Marty's is very knowledgable about this unusual package. Qman