They bring more unused Sully (NOS). I believe the 3 cams for a Z/28 are all the same 67,68,69. They were also used in the 327 injected corvettes mid 60's. Off the road cam is good if you have a steeper gear like 4.88's and up and also an M20 helps the cause with a 302 motor. Seems like the Comp and Crane spec cams are the people's choice but try them on Ebay, ya never know!
