Transplanted a 403 SBO in and took away the CCC parts, has a cam and long tubes with true dual exhaust and 200-4r from an 86 442. Currently have 3:73 posi in the 7.5 but saving up for an 8.5. I don't know if i would call it a sleeper but it is drowsy. But those couch pillow seats and my son's car seat in the back certainly make it seem that way